Environment terminology · MLC-0121

Environment terms: M (1,782)

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Microhabitata smaller part of a habitat that has some internal interactions allowing it to function self-sufficiently...
MICROIMAGEAn image too small to be read without a magnifying device or other special equipment.
MICROIMAGING SYSTEMSSystems constituting a bridge between traditional microforms and electronic records. Include stand- alone...
MicroinvertebrateAnimals without backbones that are not large enough to be seen by the unaided eye; they will not be retained...
Microinvertebrates, see Microinvertebrate
MicrolayerAny extremely thin layer of material, nutrients, organisms or specific properties that exists on or in the...
MicrolichenA crustose or squamulose lichen; physical features are difficult to see with a naked eye and a microscope is...
MicromonosporaA genus of gram-positive bacteria that forms a branched mycelium. It commonly occurs as a saprophytic form in...
Micron1. (MY-kron) A unit of length. One millionth of a meter or one thousandth of a millimeter. One micron equals...
MicronucleiSmall particles consisting of acentric fragments of chromosomes or entire chromosomes, which lag behind at...
MicronutrientA plant nutrient found in relatively small amounts (<100 mg kg-1) in plants. These are usually B, C1, Cu, Fe...
Micronutrient balance(Balance of) a class of food components required for proper health and that are typically consumed in...
MICRO-OPAQUEA sheet of translucent paper stock with multiple microimages in a grid pattern. See also MICROCARD.
Micro-organismAn organism that can only be seen with a microscope.
Microorganism1. A microscopic organism, especially a bacterium, fungus, or protozoan.
Microorganism by environmentMicroorganisms classified by the environment in which they live
Microorganism characteristic1. Feature which characterizes a microorganism.
Microorganism chloroplastPlant cell inclusion bodies that contain the photosynthetic pigment chlorophyll, which is associated with the...
Microorganism densityNumber of microorganisms per unit mass of total solids (dry weight) in the sewage sludge.
Microorganism metabolism1. The sum of the chemical reactions occurring within (the microorganism); includes the energy-releasing...
Microorganism processAn action or process performed by a microorganism. (Plant Physiology - The study of the function and chemical...
Microorganism roleA characteristic which exists only when the microorganism is interacting with another microorganism, a...
Microorganism study subjectA microorganism that is observed, analyzed, examined, investigated, experimented upon or/and treated in the...
Microorganisms, see Microorganism
Microplastics1. Plastic particles, less than 5 millimeters in diameter, that are generated from the degradation of larger...
Micropolitan statistical areaTwo categories of CBSA (metropolitan areas have populations greater than 50,000; and micropolitan areas have...
Microresistivity logRefers to a group of short-spaced resistivity logs that are used to make measurements of the mud cake and...
MicroRNA synthesisA process that begins with the synthesis of a pri-miRNA from a DNA template by RNA Polymerase II, which is...
MicrosatelliteLoci (or regions within DNA sequences) where short sequences of DNA nucleotides are repeated in tandem arrays...
Microscale lensA homogeneous parcel of water on the order of meters to a few kilometers positioned within (or atop) a larger...
Microscopic algae1. Tiny, single-celled planktonic plants. Algae, or phytoplankton, are the primary producers of food and...
MicroscopyThe application of microscope magnification to the study of materials that cannot be properly seen by the...
MicrositingResource assessment tool used to determine the exact position of one or more wind turbines on a parcel of...
MicrosomeArtifactual vesicles formed from the endoplasmic reticulum when cells are disrupted. They are isolated by...
Microstegium vimineumJapanese stiltgrass, or Nepalese browntop, is an annual grass with a sprawling habit. It germinates in spring...
MicrosurfacingPolymer-modified slurry seal.
Microtubule depolymerization processAny microtubule process involving the removal of tubulin heterodimers from one or both ends of a microtubule.
Microtubule polymerization processMicrotubule polymerization is a cellular process typically, though not solely, involved in cell motility and...
Microtubule processAny cytoskeletal process involving microtubule structures and their associated proteins.
MicroturbineVery small wind turbine, usually under a 1,000 Watt rating, which is appropriate for small energy needs...
Microvacuum sampleMicrovacuum sample, commonly called microvacuum, as per ASTM D5755, is similar to a wipe sample with the...
Microvacuum samples, see Microvacuum sample
MicrovesselThe finer blood vessels of the vasculature that are generally less than 100 microns in internal diameter.
Microwave radiationElectromagnetic radiation generally in the frequency range between 300 MHz and 300 GHz (wavelengths between...
Microwave-assisted synthesisThe use of microwaves as a method of heating for synthetic chemical reactions
Mid-Atlantic regionThe drainage within the United States that ultimately discharges into: (a) the Atlantic Ocean within and...
Mid-Atlantic Regional Air Management AssociationAn RPO consisting of mid-Atlantic states.
Middle aged adultAn adult in the 40 to 65 year old age range.
Middle ArkansasThe Arkansas River Basin below its intersect with the Colorado-Kansas state line to and including the Walnut...
Middle BrazosThe Brazos River Basin below the confluence of the Double Mountain Fork Brazos River and the Salt Fork Brazos...
Middle ColumbiaThe Columbia River Basin below the confluence with the Snake River Basin to Bonneville Dam. Oregon...
Middle earThe space and structures directly internal to the tympanic membrane and external to the inner ear...
Middle East respiratory syndromeViral respiratory illness that is new to humans. It was first reported in Saudi Arabia in 2012 and has since...
Middle GilaThe Gila River Basin within the United States from Coolidge Dam to the confluence with the Salt River Basin...
Middle OhioThe Ohio River Basin below the confluence with the Kanawha River Basin to the confluence with the Kentucky...
Middle SnakeThe Snake River Basin below the Clover Creek Basin to Hells Canyon Dam. Idaho, Nevada, Oregon. Area = 36700...
Middle Tennessee-ElkThe Tennessee River Basin below the confluence with the Sequatchie River Basin to Pickwick Dam. Alabama...
Middle Tennessee-HiwasseeThe Tennessee River Basin below Watts Bar Dam to and including the Sequatchie River Basin. Alabama, Georgia...
Middle-tier categorical industrial user1. A classification that a Control Authority may apply to certain IUs, if their discharge of categorical...
Midgrade gasolineHas an octane rating greater than or equal to 88 and less than or equal to 90. This definition applies to the...
MidgutSection of digestive tract between foregut and hindgut.
Mid-YardArea of a residential yard approximately midway between the dripline of a residential building and the...
Migration1. In electronic records, the process or result of moving files from one computer system to another.
Migration pathwayA migration pathway is a potential path or route of contaminants from the source of contamination to contact...
Migration pathways, see Migration pathway
MigratoryA species that moves from one habitat or region to another on a regular or seasonal basis.
Migratory bird1. Those species that annually move from one region to another and back again for feeding or breeding.
Migratory speciesSpecies that moves from one habitat or region to another on a regular or seasonal basis.
MilA unit of length equal to 0.001 of an inch. The diameter of wires and tubing is measured in mils, as is the...
Milbrink indexA trophic index based on the composition and abundance of oligochaetes (worms) that live in the sediment.
Mild hybrid electric vehicleHybrid electric vehicle that has start/ stop capability and regenerative braking capability, where the...
Mild hybrid engineHybrid engine or powertrain with regenerative braking capability where the system recovers less than 20...
MildewA common name for a fungus that leaves a thin white coating on the surface of plants and other materials...
Mildews, see Mildew
MileageAn allowance for traveling expenses at a certain rate per mile.
Miles per gallonMiles per gallon, a measure of fuel economy.
Miles up reachThe value used to identify the station location indicated by the number of miles up the reach.
Milestone1. Meaning given in CAA sections 182(g)(1) and 189(c) for serious and above ozone nonattainment areas and...
Milestone year inventoryProjected RFP emission inventory for the applicable RFP milestone year (i.e. 2009 and, where applicable...
MilitaryDepartment of Defense (DOD), the Armed Services, Coast Guard, National Guard, Department of Energy (DOE), or...
Military aircraftAircraft owned by, operated by, or produced for sale to the armed forces or other agency of the federal...
Military constituentAny materials originating from unexploded ordnance, discarded military munitions, or other military...
Military constituents, see Military constituent
Military engineAny engine manufactured solely for the Department of Defense to meet military specifications.
Military exterior specialty coatingAny exterior topcoat applied to military or U.S. Coast Guard vessels that are subject to specific chemical...
Military munition1. All ammunition products and components produced or used by or for the U.S. Department of Defense (DoD) or...
Military munitions, see Military munition
Military Munitions Response ProgramThe Military Munitions Response Program (MMRP) is a Department of Defense (DoD) program that addresses the...
Military rangeDesignated land and water areas set aside, managed, and used to conduct research on, develop, test, and...
Milk feverA disease of pregnant and lactating cows and ewes leading to generalized paresis and death. The disease...
Milk handlersProcessors or dealers of milk who commonly purchase raw milk and sell pasteurized milk and milk products.
Milk houseThe area near a milking parlor where the bulk milk tank, cleaning units, and equipment are located.
Milk house wasteWater having been used in cleaning the milking equipment and washing the parlor.
Milk River BasinThe Milk River Basin within the United States, including the Wild Horse Lake closed basin. Montana. Area =...
Milking parlorFacility where lactating cows are managed before, during, and after milking.
Milking pitA sunken area that houses both the milker and some milking equipment during milking. This places the milker...
Milky diseaseDisease of Japanese beetle grubs. Commonly called Milky Spore Disease
Mill brokeAny paper waste generated in a paper mill prior to completion of the papermaking process. It is usually...
Mill enrollmentTo notify the permitting authority that a mill intends to participate in the “Voluntary Advanced Technology...
Mill equipmentPressurized equipment that uses the dispersing action of beads, combined with the high shearing forces of the...
Mill pressurized equipmentPressurized equipment that uses the dispersing action of beads, combined with the high shearing forces of the...
Mill tailings1. Residue from milling processes (e.g., flotation tailings, gravity tailings, leach tailings, etc.).
Millennial scale climate variabilityClimate changes in the period of 10,000 years or less
MilligramOne-thousandth of a grain (3.5 x 10-1 oz; 0.000035 oz).
Milligrams per literA measure of concentration of a dissolved substance. A concentration of one mg/L means that one milligram of...
Milligrams/literA measure of concentration used in the measurement of fluids. Mg/l is the most common way to present a...
Millimeters of mercury1. This is a measure of vapor pressure.
Millimicron(MILL-uh-MY-kron) A unit of length equal to 10-3 microns (one thousandth of a micron), 10-6 millimeters, or...
Milling1. Industrial operations that process ores to concentrate desired minerals. According to the Atomic Energy...
Milling equipmentSize reduction equipment
Milling (Nanoscale Material Creation)Nanoscale material creation from its macro-scale counterpart.
Million gallons per day1. A unit of flow commonly used for wastewater discharges. One mgd is equivalent to 1.547 cubic feet per...
MilliremRem (historically standing for “roentgen equivalent man”) is the special name for the unit of dose equivalent...
Mill-ready cullet1. Refers to crushed and whole contaminant-free scrap container glass that complies with the proper Institute...
MillwrightThe highly skilled workers who install, assemble, and, when necessary, dismantle machinery in factories...
Minamata diseaseMercury poisoning of humans from eating contaminated seafood.
Mine1. An opening or excavation in the ground for the purpose of extracting minerals.
Mine areaLand area from which overburden is stripped and ore is removed prior to moving the ore to the beneficiation...
Mine backfill wellsClass V wells that inject water, sand, mill tailings, or other mining byproducts in order to control...
Mine bankA steeply sloping mass of any earthy or rock material rising above the digging level from which the soil or...
Mine dewatering1. Any water that is impounded or that collects in the mine and is pumped, drained or otherwise removed from...
Mine drainage1. Any water drained, pumped or siphoned from a mine.
Mine foremanThe person charged with the responsibility of the general supervision of the underground workings of a mine...
Mine inspectorOne who checks mines to determine the safety condition of working areas, equipment, ventilation, and...
Mine portalMine entrance from the side of a hill.
Mine, quarry and pitUses of land for extraction of ores, minerals, and rock materials; a subcategory of the land cover/use...
Mine reclamationRestoration of mined land to original contour, use, or condition. Also describes the return of land to...
Mine sumpThe lowest part of a mine shaft into which water drains.
Mine tailings1. Residue from milling processes (e.g., flotation tailings, gravity tailings, leach tailings, etc.).
Mine tailings damAn industrial waste dam in which the waste materials come from mining operations or mineral processing.
Mine type1. An opening or excavation in the earth for the purpose of extracting minerals.
Mine ventilation systemSystem that is used to control the concentration of methane and other gases within mine working areas through...
Mine waste cleanup technologyRemediates contaminated mine waste and mine water. The technology includes re-vegetation, removal, biological...
Mine waste containmentUsed at sites to control or capture the contaminants to reduce or minimize releases. Examples of this...
Miner1. One who mines; as one engaged in the business or occupation of getting ore, coal, precious substances, or...
Mineral1. Any natural resource extracted from the earth for human use; e.g., ores, salts, coal, or petroleum.
Mineral aerosolMineral dusts in the atmosphere coming primarily from soils in the earth's deserts
Mineral carbonates1. Rock-forming minerals containing the carbonate anion. Sedimentary rocks made mainly of calcium carbonate...
Mineral compositionThe naturally occurring chemical compound or limited mixture of chemical compounds occurring in rocks
Mineral deposit1. A mineral occurrence of sufficient size and grade that it might, under favorable circumstances, be...
Mineral dustSoil particles suspended in the atmosphere, mainly of natural origin although about 30% is caused by human...
Mineral extractionThe process of removing ore from the ground.
Mineral extraction landLand from which underground natural resources are removed
Mineral fiber insulationInsulation (rock wool or fiberglass) which is composed principally of fibers manufactured from rock, slag or...
Mineral halidesRock-forming minerals containing halide anions
Mineral handling and storage facilityAreas in asphalt roofing plants in which minerals are unloaded from a carrier, the conveyor transfer points...
Mineral hydroxidesRock-forming minerals containing hydroxide anions
Mineral occurrenceA concentration of mineral that is considered to be valuable or that is of technical or scientific interest.
Mineral oil polychlorinated biphenyls transformerAny transformer originally designed to contain mineral oil as the dielectric fluid and which has been tested...
Mineral oxidesRock-forming minerals with an oxide anion
Mineral phosphatesRock-forming minerals containing phosphate anions
Mineral processingPreparation of ores by physical methods. A subcategory of metallurgy. Methods of mineral processing include...
Mineral processing plantAny facility that processes or produces any of the following minerals, their concentrates or any mixture of...
Mineral reserveQuantity of mineral demonstrated to be present and known to be economically producible.
Mineral rights1. The ownership of the minerals under a given surface, with the right to enter thereon, mine, and remove...
Mineral silicatesRefers to minerals containing the chemical unit silicon tetroxide, SiO4, as their fundamental building...
Mineral soil1. Soil that consists mainly of inorganic material, such as weathered rock, rather than organic matter.
Mineral speciesTerm used in this report to distinguish specific mineralogical species from the unmodified term "mineral."
Mineral sulfatesRock-forming minerals containing sulfate anions
Mineral sulfidesRock-forming minerals containing sulfide anions
Mineral vein1. A mineral-filled fracture or fault in a rock.
Mineral waterWater originating from protected groundwater, and which naturally contains mineral salts or gases (carbon...
Mineral weatheringThe physical and chemical breakdown of rocks that releases ions such as calcium and aluminum.
Mineralization1. The transformation of organic matter into a mineral or an inorganic compound.
Mineralization process1. The formation of minerals. New minerals may be added to fractures and empty spaces in a rock or by...
Mine-scarred landMine-scarred lands are defined as lands, associated waters, and surrounding watersheds where extraction...
Mini coreThose chemicals and chemical categories which have been on the TRI List since 1995 and for which there have...
Mini core chemicalThose chemicals and chemical categories which have been on the TRI List since 1995 and for which there have...
Mini trendA set of RSEI results for TRI reporting years 1995-2011. In order for the results to be meaningful, the...
Mini trialTwo-step process to facilitate settlement in which (a) the parties' attorneys present a summary of the...
MINICOMPUTERA small digital computer, normally able to process and store less data than a mainframe but more than a...
Minimal impact site developmentDevelopment that does not significantly alter the existing vegetation and hydrology of the vegetation and...
Minimal soil disturbancedescribes soils that are minimally graded and/or compacted, such that compaction levels exceed the Maximum...
Minimally disturbedBiological conditions found in water bodies with minimum human disturbance.
Minimally impairedSites or conditions with slight anthropogenic perturbation relative to the overall region of the study.
Minimally impaired conditionSites or conditions with slight anthropogenic perturbation relative to the overall region of the study.
Minimally toxic effectSubstance must pass either OECD 201, 202, and 203 for acute toxicity testing, or OECD 210 and 211 for chronic...
Minimally toxic substanceSubstance must pass either OECD 201, 202, and 203 for acute toxicity testing, or OECD 210 and 211 for chronic...
Minimally-toxic soaps, cleaners, and detergentsAny substance or mixture of substances which has an acute aquatic toxicity value (LC50) corresponding to a...
Minimization1. Measures or techniques that reduce the amount of wastes generated during industrial production processes...
Minimize extentTo reduce to the smallest amount, extent, or degree reasonably possible.
Minimizing asthma riskTaking steps to avoid triggers that could cause asthma, such as air pollution, mold and second-hand smoke.
MinimumThis limitation duration is used when describing a minimum percent removal for amalgam separators in the...
Minimum 96-Hour Lethal Concentration 50 PercentApplied to BAT effluent limitations and NSPS for drilling fluids and drill cuttings means the minimum 96-hour...
Minimum activated carbon injection rateLoad fraction multiplied by the lowest hourly average activated carbon injection rate measured according to...
Minimum allocationAmount made available to each Gulf Coast State which totals at least five percent of the total allocation...
Minimum allowable concentration1. Applied to BPT and BCT effluent limitations and NSPS for sanitary wastes means the minimum concentration...
Minimum amperage90 percent of the highest 3-hour average horsepower or amperage to the wet scrubber (taken, at a minimum...
Minimum concentrationApplied to BPT and BCT effluent limitations and NSPS for sanitary wastes means the minimum concentration...
Minimum control efficiency (%)A constraint for a control strategy that requires each control measure used in the strategy to have a control...
Minimum control levelThe pollutant load that a point source buyer must first meet before buying credits to meet the facility’s...
Minimum Dioxin/Furan Sorbent Flow Rate90 percent of the highest 3-hour average dioxin/furan sorbent flow rate (taken, at a minimum, once every...
Minimum efficiency reporting valueConsumers can select a particle removal air filter by looking at its efficiency in removing airborne...
Minimum emissions reduction (tons)A constraint for a control strategy that requires each control measure to reduce the target pollutant by the...
Minimum horsepower90 percent of the highest 3-hour average horsepower or amperage to the wet scrubber (taken, at a minimum...
Minimum hydrogen chloride sorbent flow rate90 percent of the highest 3-hour average HCl sorbent flow rate (taken, at a minimum, once every hour)...
Minimum infective doseThis term was intended to indicate the lowest dose that would cause infection in an individual and assumed...
Minimum level1. A minimum level at which the analytical system shall give recognizable mass spectra (background corrected)...
Minimum mercury sorbent flow rate90 percent of the highest 3-hour average Hg sorbent flow rate (taken, at a minimum, once every hour) measured...
Minimum NPDES data setData and information listed in appendix A to this part.
Minimum oxygen levelLowest hourly average oxygen level measured according to Table 6 to this subpart during the most recent...
Minimum percent reduction difference for replacement control (%)A constraint for a control strategy that requires each assigned control measure to cause a percent reduction...
Minimum pressure drop across wet scrubber90 percent of the highest 3-hour average pressure drop across the wet scrubber PM control device (taken, at a...
Minimum reagent flow rate1. 90 percent of the highest 3-hour average reagent flow rate at the inlet to the selective noncatalytic...
Minimum reporting level1. The minimum concentration that can be reported as a quantitated value for a target analyte in a sample...
Minimum reporting level (regulatory), see Minimum reporting level
Minimum scrubber liquid flow rateLowest hourly average scrubber liquid flow rate (e.g., to the particulate matter scrubber) measured according...
Minimum scrubber liquor flow rate90 percent of the highest 3-hour average liquor flow rate at the inlet to the wet scrubber (taken, at a...
Minimum scrubber liquor pH90 percent of the highest 3-hour average liquor pH at the inlet to the wet scrubber (taken, at a minimum...
Minimum scrubber pressure dropLowest hourly average scrubber pressure drop measured according to Table 6 to this subpart during the most...
Minimum secondary chamber temperature1. 90 percent of the highest 3-hour average secondary chamber temperature (taken, at a minimum, once every...
Minimum sorbent injection rate1. The load fraction multiplied by the lowest hourly average sorbent injection rate for each sorbent measured...
Minimum (statistics)The lowest data value recorded during the period of record.
Minimum total secondary electric powerLowest hourly average total secondary electric power determined from the values of secondary voltage and...
Minimum treatment volumeThe minimum volume necessary for the design HRT or loading rate.
MiningThe term "mining" includes not merely the extraction of the ores or minerals from the ground but also the...
Mining areaA set of boundaries available in Reference Map that focus on geographies relevant to the census of mineral...
Mining (Coal), see Mining
Mining (Hardrock), see Mining
Mining megasiteGenerally, a site is considered to be a megasite if the combined extramural, actual and planned, removal and...
Mining (Non-Metals), see Mining
Mining of an aquiferWithdrawal over a period of time of ground water that exceeds the rate of recharge of the aquifer.
Mining property developmentPreparation of a mining property so that an ore body can be analyzed and its tonnage and quality estimated...
Mining, quarrying, and oil and gas extractionThe Mining, Quarrying, and Oil and Gas Extraction sector comprises establishments that extract naturally...
Mining waste1. Residues resulting from the extraction of raw materials from the earth.
Mining waste dischargeAcid drainage from mine waste rock, tailings, and mine structures such as pits and underground workings is...
Mining water useWater use during quarrying rocks and extracting minerals from the land.
Mining well1. Class III wells inject fluids to dissolve and extract minerals such as uranium, salt, copper, and sulfur...
Mini-truckMini-trucks are small trucks or vans, with an engine displacement below 1000 cubic centimeters and a maximum...
MinivanLight truck which is designed primarily to carry no more than eight passengers, having an integral enclosure...
Mink diseasesDiseases of minks, which are semiaquatic mustelid carnivores,
MinnesotaThe Minnesota River Basin. Iowa, Minnesota, South Dakota. Area = 16800 sq.mi.
Minor alternative provisionAlternative provision to the Compliance Criteria that only clarifies an existing regulatory provision, or...
Minor dischargeDischarge to the inland waters of less than 1,000 gallons of oil or a discharge to the coastal waters of less...
Minor floodingMinimal or no property damage, but possibly some public threat. Note: all three of the lower flood categories...
Minor NSR thresholdAny of the applicability cutoffs for this program listed in Table 1 of § 49.153.
Minor permit modificationTitle 40 of the Code of Federal Regulations (40 CFR) Section 144.41 allows modifications of UIC permits...
Minor releaseRelease of a quantity of hazardous substance(s), pollutant(s), or contaminant(s) that poses minimal threat to...
Minor repair and maintenanceActivities, including minor heating, ventilation or air conditioning work, electrical work, and plumbing...
Minor source1. New emissions sources or modifications to existing emissions sources that do not exceed NAAQS emission...
Minor source allowable emissionInclude fugitive emissions, to the extent that they are quantifiable, only if the source belongs to one of...
Minor streetLocal streets not shown on the General Plan Circulation Plan, Map, or Diagram, whose primary intended purpose...
Minor use"The use of a pesticide on an animal, on a commercial agricultural crop or site, or for the protection of...
Minority business enterpriseDisadvantaged Business Enterprise (DBE) other than a Small Business Enterprise (SBE), a Labor Surplus Area...
Minority populationsAccording to the U.S. Census Bureau, population of people who are not single-race white and not Hispanic...
MinorsPublicly owned treatment works with flows less than 1 million gallons per day.
MiosisContraction of the pupil
Miscellaneous ACMInterior asbestos-containing building material or structural components, members or fixtures, such as floor...
Miscellaneous asbestos-containing materialMiscellaneous material that is ACM in a school building.
Miscellaneous coating operationApplication of any of the following to plywood or composite wood products: edge seals, moisture sealants...
Miscellaneous gaseous emissions ventGaseous emissions from samples, loading and unloading lines, slip gauges, process wastewater treatment...
Miscellaneous hazardous waste management unitHazardous waste management unit where hazardous waste is treated, stored, or disposed of and that is not a...
Miscellaneous interior building materialInterior building material on structural components, structural members or fixtures, such as floor and...
Miscellaneous materialMeans interior building material on structural components, structural members or fixtures, such as floor and...
Miscellaneous materials, see Miscellaneous material
Miscellaneous Metal/Plastic PartAny part or product made of metal or plastic, or combinations of metal and plastic. Miscellaneous parts...
Miscellaneous Metal/Plastic ProductAny part or product made of metal or plastic, or combinations of metal and plastic. Miscellaneous parts...
Miscellaneous mobile equipmentStreet cleaners, golf carts.
Miscellaneous oil spill control agentAny product, other than a dispersant, sinking agent, surface washing agent, surface collecting agent...
Miscellaneous organic chemical manufacturing process1. All equipment which collectively function to produce a product or isolated intermediate that are materials...
Miscellaneous process ventGas stream containing greater than 20 parts per million by volume organic HAP that is continuously or...
Miscellaneous refined petroleum productAll refined petroleum products not defined elsewhere. It includes, but is not limited to, naphtha-type jet...
Miscellaneous surface coating facilityAny shop, business, location, or parcel of land where paint stripping or miscellaneous surface coating...
Miscellaneous surface coating operationCollection of equipment used to apply surface coating to miscellaneous parts and/or products made of metal or...
Miscellaneous unitsHazardous waste treatment, storage, or disposal units regulated under RCRA that do not meet any of the other...
Miscellaneous waste streamAdditional waste streams related to forming copper: hydrotesting, sawing, surface milling, and maintenance.
Miscellaneous wastewater streamCombined wastewater streams from the process operations listed below for each subcategory. If a plant has one...
MischmetalRare earth metal alloy comprised of the natural mixture of rare earths to about 94-99 percent. The balance of...
MiscibleCapable of mixing in any ratio without separation of two phases
Miscible liquidsTwo or more liquids that can be mixed and will remain mixed under normal conditions.
MishapEvent that adversely affects man or the environment and that is related to the use or presence of a...
Mismatch repairThe mismatch repair (MMR) system promotes genomic fidelity by repairing base-base mismatches...
Missed detectionThe situation that occurs when a test indicates that a tank is "tight" when in fact it is leaking.
MissionThe part of a goal or endeavor assigned as a specific responsibility of a particular organizational unit. It...
Mission consequenceEffect of an incident, event, operation, or occurrence on the ability of an organization or group to meet a...
Mission critical infrastructureAny telecommunications or information system that is defined as a national security system (Federal...
Mission program supportMission Program Support includes legal services to support the agency's external mission.
Mission sensitiveRestricted, non-classified homeland security and or infrastructure information (site data, incident response...
Mission-critical military end usesUses of regulated substances by an agency of the Federal Government responsible for national defense that...
Mission-relevant researchRelevance to mission is one key component of how ORD defines excellence.
Mississippi headwatersThe Mississippi River Basin above the confluence with the St. Croix River Basin, excluding the Minnesota...
Missouri headwatersThe Headwaters of the Missouri River Basin above the confluence of and including the Gallatin, Jefferson, and...
Missouri regionThe drainage within the United states of: (a) the Missouri River Basin, (b) the Saskatchewan River Basin, and...
Missouri-Big SiouxThe Missouri River Basin from Fort Randall Dam to and including the Big Sioux River Basin, but excluding the...
Missouri-Little MissouriThe Missouri River Basin below the confluence with the Yellowstone River Basin to Garrison Dam. Montana...
Missouri-Little SiouxThe Missouri River Basin below the confluence with the Big Sioux River Basin to the confluence with the...
Missouri-MariasThe Missouri River Basin below the confluence of the Gallatin, Jefferson, and Madison River Basins to and...
Missouri-MusselshellThe Missouri River Basin below the confluence of the Marias River Basin to Fort Peck Dam. Montana. Area =...
Missouri-NishnabotnaThe Missouri River Basin below the confluence with the Platte River Basin to the confluence with the Kansas...
Missouri-OaheThe Missouri River Basin from Garrison Dam to Oahe Dam, excluding the Cheyenne River Basin above the normal...
Missouri-PoplarThe Missouri River Basin within the United States from Fort Peck Dam to the confluence with the Yellowstone...
Missouri-WhiteThe Missouri River Basin from Oahe Dam to Fort Randall Dam. Nebraska, South Dakota. Area = 20200 sq.mi.
Mist1. Liquid particles measuring 40 to 500 micrometers (pm), are formed by condensation of vapor. By comparison...
Mist solutionHydrocarbon or aqueous solution used as an application aid with solvent-based or waterborne end seal...
Mist specialty coatingAny low viscosity, thin film, epoxy coating applied to an inorganic zinc primer that penetrates the porous...
Miter drainA drain that is at an angle (e.g., 45 degrees) to the surface that is being drained (e.g., a grassed swale)...
MitesTiny eight-legged animals that live off plants, animals or stored food.
MiticideSubstance which kills mites that feed on plants and animals.
Miticides, see Miticide
Mitigation1. Actions taken to avoid, reduce, or compensate for the effects of environmental damage. Among the broad...
Mitigation bank1. Site, or suite of sites, where resources (e.g., wetlands, streams, riparian areas) are restored...
Mitigation bankingA wetlands mitigation bank is a wetland area that has been restored, established, enhanced or reserved, which...
Mitigation banking instrumentLegal document for the establishment, operation, and use of a mitigation bank.
Mitigation measureAny method of reducing emissions of the pollutant or its precursor taken at the location of the Federal...
Mitigation technologyTechnology which reduces the seriousness of the environmental pollutant discharge.
Mitochondria1. Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the...
Mitochondrial damageMitochondrial Damage involves any process that leads to dysfunction of mitochondria, whether by oxidative...
Mitochondrial DNATypically small, circular, intronless, and maternally inherited, mitochondrial DNA (mtDNA) is the multicopy...
Mitosis1. The usual process of somatic reproduction of cells consisting of a sequence of modifications of the...
Mitotic checkpointThe mitotic/spindle checkpoint ensures that all replicated chromatids are properly connected to opposing...
Mitotic chromosomal processA biological process that occurs during mitosis to ensure proper chromosomal numbers in daughter cells.
Mitotic recombinationAny type of recombination occuring within somatic cells and involving possible exchange and frequent loss of...
Mitotic sister chromatid cohesionThe faithful segregation of genetic information requires highly orchestrated changes of chromosome structure...
Mix preparation equipmentVessels, except for mills, used to prepare the magnetic coating.
Mix tank1. A control point where manure is collected and added to water or dry manure to achieve the required solids...
Mixed cellulose esterA type of filter used for air sampling.
Mixed digesteranaerobic digester that has received feedstocks under both an approved pathway with D code 3 or 7 and an...
Mixed fertilizerMixture of wet and/or dry straight fertilizer materials, mixed fertilizer materials, fillers and additives...
Mixed fuel engineMixed-fuel vehicle/engine means any vehicle/engine engineered and designed to be operated on the original...
Mixed fundingSettlements in which potentially responsible parties and EPA share the cost of a response action.
Mixed glass1. Refers to recovered container glass that is not sorted into specific categories (color and grade).
Mixed layerAn atmospheric layer, usually the layer immediately above the ground, in which pollutants are well mixed by...
Mixed liquorA mixture of activated sludge and water containing organic matter undergoing activated sludge treatment in an...
Mixed metalRecovered metal that is not sorted into specific categories (aluminum cans, tin/steel cans, other ferrous...
Mixed metals, see Mixed metal
Mixed municipal solid wasteRefers to municipal solid waste that is not sorted into specific categories (plastics, glass, and yard...
Mixed municipal wasteSolid waste that has not been sorted into specific categories (such as plastic, glass, yard trimmings, etc.)
Mixed paper1. Refers to recovered paper that is not sorted into specific categories (old magazines, old newspapers, and...
Mixed plastic1. Refers to recovered plastic that is not sorted into specific categories (HDPE,LDPE, and PETE).
Mixed semi-diurnal tidal flowTidal ocean waters where the amplitudes of two semi-diurnal tides are unequal, resulting in a stronger and a...
Mixed urban or built up land1. Urban built up land where a number of uses are on a single site
Mixed use projectA project that is designed for more than one land use category (for example, Single-Family Housing and...
Mixed waste1. Radioactive waste that is also a hazardous waste under RCRA. Such wastes are jointly regulated by RCRA and...
Mixed-function oxidaseThe name of a family of oxidase enzymes that catalyze a reaction in which each of the two atoms of oxygen in...
Mixed-use meter1. A meter measuring water use for more than one type of end use (such as indoor and outdoor use).
MixheadDevice that mixes two or more component streams before dispensing foam producing mixture to the desired...
Mixing agent (chemical vehicle)Any agent which facilitates the mixture, dispersion, or solubilization of a test substance with a carrier.
Mixing, compounding, and formulating operationProcesses that put pharmaceutical products in dosage forms.
Mixing instructionCoating or coating component manufacturer's or importer's specification of the quantities of coating...
Mixing layerThe atmosphere's mixing layer is the near-surface area where air is well mixed from turbulence caused by the...
Mixing vesselProcess container where reactants are blended in a step toward manufacturing a product.
Mixing zone1. An area where an effluent discharge undergoes initial dilution and is extended to cover the secondary...
Mixture1. Any combination of two or more chemical substances if the combination does not occur in nature and is not...
Mixture group 1Any product whose only pesticidal active ingredient(s) is: a common food/food constituent or non-toxic...
Mixture group 2Those chemicals listed in Table 9 to this part 455.
Mixture ruleA rule that is intended to ensure the regulation of mixtures of listed wastes with nonhazardous solid wastes.
<MLThis indicates that the limitation value is less than the minimum level.
Mnemonic filing systemA classification system in which records are coded by symbols to remind the user of the subject; for example...
Mobile appSoftware tool that runs on a mobile device (smart phone, tablet computer or similar device) connected to the...
Mobile dental unitSpecialized mobile self-contained van, trailer, or equipment used in providing dentistry services at multiple...
Mobile emissionsThe emissions from motorized sources for both the onroad and nonroad data categories.
Mobile EquipmentAny equipment that is physically capable of being driven or drawn upon a highway including, but not limited...
Mobile equipment surface coatingSpray application of coatings to assembled motor vehicles or mobile equipment. For the purposes of this...
Mobile GC/MSField-transportable GC/MS is a versatile technique that can be used to provide rapid screening data or...
Mobile genetic elementElement of genetic material that has the ability to move genetic material within and between organisms...
Mobile incinerator systemsHazardous waste incinerators that can be transported from one site to another.
Mobile or portable storage tankAny container used to store oil and that is capable of being easily moved. For example, a 55-gallon drum or a...
Mobile refuelerBulk storage container onboard a vehicle or towed, that is designed or used solely to store and transport...
Mobile siteA mobile cart was used for making measurements at all of the indoor mobile locations. Typically there were...
Mobile source1. Any non-stationary source of air pollution such as cars, trucks, motorcycles, buses, airplanes, and...
Mobile source air toxicsAir toxics that are emitted from non-stationary objects that release pollution. Mobile sources include cars...
Mobile source control deviceControl devices that limit or control any non-stationary source of air pollution such as cars, trucks...
Mobile source emissions1. Emission from any non-stationary source of air pollution such as cars, trucks, motorcycles, buses...
Mobile source modelRepresentation of processes that emit pollutants from mobile sources
Mobile source type emissionEmission from a wide variety of vehicles, engines, and equipment that generate air pollution and that move...
Mobile sources fuelFuel (gas, diesel, alternative fuels) used for any non-stationary source of air pollution such as cars...
Mobile storage tankAny container used to store oil and that is capable of being easily moved. For example, a 55-gallon drum or a...
MOBILE6The computer model used to estimate various pollutant emission factors for onroad vehicles.
Mobile-TombigbeeThe drainage into Mobile Bay excluding the Alabama River Basin. Alabama, Mississippi. Area = 21900 sq.mi.
MobilityThe ability of a chemical element or a pollutant to move into and through the environment (e.g., the...
MobilizationThe movement of equipment and personnel to the site, conducted during a continuous time frame to prepare for...
Modacrylic fiberManufactured synthetic fiber in which the fiber-forming substance is any long-chain synthetic polymer...
Mode1. A measure of central tendency, the value of a variable that occurs most frequently; a statistic used...
Mode of action1. Understanding how chemicals perturb normal biological function; the key steps in the toxic response after...
Mode of deliveryThe mechanisms the government uses to achieve the purpose of government, or its "Services to Citizens." It...
Model1. A simplification of reality that is constructed to gain insights into select attributes of a physical...
Model applicationThe use of a model or models to address defined questions at a specific location.
Model based causation1. The most likely cause is the one that, when mathematically modeled, best fits and therefore best explains...
Model boundary1. Designates areas of competence of the model, including time, space, pathogens, pathways and exposed...
Model building codeDocuments specifying requirements for building, mechanical, plumbing, and fire prevention installations...
Model building codes, see Model building code
Model by environmental mediaModels classified by the environmental media
Model by subjectModels classified by the phenomenon they describe.
Model calibration1. Refinement of mathematical model parameters and coefficients through comparison to data by making...
Model characteristicParticular attribute of the model being used, often relevant for the entire model.
Model coatingCoating which is designed and labeled exclusively for hobby applications and is sold in aerosol containers of...
Model codeInstructions, written in the syntax of a computer language, that provide the computer with a logical process...
Model code organizationsIncludes the following agencies and the model building codes they promulgate: Building Officials and Code...
Model code verificationChecking of the model code for accuracy, completeness, etc.
Model codesDocuments specifying requirements for building, mechanical, plumbing, and fire prevention installations...
Model codingThe process of translating the mathematical equations that constitute the model framework into a functioning...
Model conceptual basisThis is the underlying scientific foundation of model algorithms or governing equations. The conceptual basis...
Model corroborationQuantitative and qualitative methods for evaluating the degree to which a model corresponds to reality. In...
Model descriptionCharacterization of the model, usually including methodology employed, input needed, output expected, etc.
Model discrepancyDifference between model predictions and measured data.
Model domainThe spatial and temporal domains of a model cover the extent and resolution with respect to space and time...
Model evaluation1. The process used to generate information to determine whether a model and its results are of a quality...
Model external peer reviewEvaluation of a model by a group of experts not associated with the creators or users of the model.
Model form1. Models can be represented and solved in different forms, including analytic, stochastic, and simulation.
Model framework1. The model framework is the system of governing equations, parameterization and data structures that make...
Model framework developmentThe model framework is the system of governing equations that make up the mathematical model. It is a formal...
Model framework testingThe full model framework is tested as the ultimate level of integration testing to verify that all...
Model framework uncertaintyThe uncertainty in the underlying science and algorithms of a model. Model framework uncertainty is the...
Model module tesingChecks ensure that the computer code for each module is computing outputs accurately and within any specific...
Model parameter1. A quantity that cannot vary in a particular model run.
Model parameter estimationProcess of determining unknown parameters in a model indirectly from data which can be measured.
Model pedigreeA qualitative or quantitative determination of the rigor with which a model has been developed and evaluated...
Model plantA hypothetical plant design used for developing economic, environmental, and energy impact analyses as...
Model problem statementA problem statement contains a targeted interest or concern, context, objectives, questions to be addressed.
Model selectionChoice of the most appropriate model for effective analysis of the data in hand.
Model sensitivity analysisExamination of the output of a model to study how much it is affected by changes in the input data.
Model standard1. A document that has been developed and established to connote specified consensus and approval of certain...
Model structureA set of assumptions and inference options upon which a model is based, including underlying theory as well...
Model testingShould be undertaken against alternative data sets. In IEM, it is important to test component models...
Model uncertainty1. Uncertainty regarding gaps in scientific theory required to make predictions on the basis of causal...
Model uncertainty analysisExamination of possible causes of imprecision in the output of a model. These can include measurement errors...
Model validationThe process by which the model is evaluated by comparing a model prediction with empirical data.
Model variableA quantity that can vary in a particular model run.
Model year1. Model year refers to the actual annual production period (year) as determined by the manufacturer.
Modeled gas consumedQuantity of gas used during wafer/substrate processing over some period based on a verified facility-specific...
Modeled hazardThe number of modeled pounds multiplied by the toxicity weight for the appropriate exposure pathway (e.g...
Modeled mediaThe media for which full risk-related modeling is conducted in the RSEI model. These media include the...
Modeled poundsPounds reported by the facility that are modeled and accounted for in the risk score. Reasons that pounds may...
Modeling1. Use of mathematical equations to simulate and predict real events and processes.
Modeling nodeIn air quality modeling, the location where impacts are predicted.
Modeling systemA computer program or software package that incorporates a model and input and output systems to facilitate...
ModemAn abbreviated term for "modulator-de-modulator." A modem converts digital signals into analog signals (and...
Moderate floodingSome inundation of structures and roads near stream. Some evacuations of people and/or transfer of property...
Moderate soil disturbancedescribes soils in which topsoil is compacted such that compaction levels exceed the Maximum Allowable Bulk...
Modes (of models)Manner in which a model operates. Models can be designed to represent phenomena in different modes...
Modified bin methodWay of calculating the required heating or cooling for a building based on determining how much energy the...
Modified dischargeVolume, composition, and location of the discharge proposed by the applicant for which a modification under...
Modified facility1. Facility which has undergone the addition, completion, or recompletion of one or more oil and natural gas...
Modified Hospital/Medical/Infectious Waste IncineratorAny change to an HMIWI unit after the effective date of these standards such that:(1) The cumulative costs of...
Modified landLand managed and modified by humans for traditional and commercial purposes. Land where humans have modified...
Modified municipal waste combustor unitMunicipal waste combustor unit to which changes have been made if the cumulative cost of the changes, over...
Modified potroom groupExisting potroom group to which any physical change in, or change in the method of operation of, results in...
Modified source1. The enlargement of a major stationary pollutant sources is often referred to as modification, implying...
Modified-process techniqueUsing any technique designed to minimize emissions without the use of add-on pollution controls.
Modify polyether polyol productProduce the polyether polyol by polymerization of epoxides or other cyclic ethers with compounds having one...
Modifying factorA factor used in the derivation of a reference dose or reference concentration. The magnitude of the MF...
Modular excess-air municipal waste combustor1. Combustor that combusts municipal solid waste and that is not field-erected and has multiple combustion...
Modular starved-air municipal waste combustor1. Combustor that combusts municipal solid waste and that is not field-erected and has multiple combustion...
Modular threshold rampRamps used to modify existing door thresholds and other small rises to remove access barriers created by...
ModuleAn independent or self contained component of a model, which is used in combination with other components...
Moisture content1. The amount of water lost from soil upon drying to a constant weight, expressed as the weight per unit of...
MolarA molar solution consists of one gram molecular weight of a compound dissolved in enough water to make one...
MolarityA molar solution consists of one gram molecular weight of a compound dissolved in enough water to make one...
Mold1. A group of organisms that belong to the kingdom Fungi. In this course, the terms fungi and mold are used...
Mold controlPrevention or remediation of mold in homes, schools, and commercial buildings
Mold food contaminantMolds that may contaminate human food, including crops grown for human consumption
Mold making lineCollection of equipment that is used to mix an aggregate of sand and binder chemicals, form the aggregate...
Mold releaseCoating applied to a mold surface to prevent the molded piece from sticking to the mold as it is removed.
Mold release agentAny material which, when applied to the mold surface, serves to prevent sticking of the foam part to the mold.
Molded flexible polyurethane foamFlexible polyurethane foam that is produced by shooting the foam mixture into a mold of the desired shape and...
Molded particleboardShaped composite product (other than a composite panel) composed primarily of cellulosic materials (usually...
MoldingIn most molding operations, the forming of the intermediate or final plastic product takes place in a closed...
Molds, see Mold
Mold-yeast dimorphismAbility of some fungi to alternate between mold form and yeast form, usually in response to environmental...
MoleThe molecular weight of a substance, usually expressed in grains.
Molecular diffusionProcess whereby molecules of various gases tend to intermingle and eventually become uniformly dispersed.
Molecular diffusivityRepresents the propensity of a chemical to move through a medium, and is a function of the chemical...
Molecular entrapmentA molecular interaction in which a small molecule or structure becomes trapped, usually in a larger molecule...
Molecular interaction processInvolves temporary, non-covalent binding of two or more molecules as a result of intermolecular physical...
Molecular markerAn easily discerned measure of the genotype of an individual at a locus based on molecular biological...
Molecular marker activityMolecular Marker Activity involves temporary non-covalent interaction through intermolecular physical forces...
Molecular methodLaboratory techniques that are based on identification and characterization of certain molecules and gene...
Molecular mimicry1. The process in which structural properties of an introduced molecule imitate or simulate molecules of the...
Molecular modelModels used experimentally or theoretically to study molecular shape, electronic properties, or interactions...
Molecular polarityA quality that is inherent in a molecule or chemical bond due to the presence or absence of dipole moments.
Molecular signatureA form of gene and protein expression profiling that is indicative of the biological behavior of a tumor or...
Molecular subunit1. Subunit that is covalently linked to at least two other subunits. Internal subunits of polymer molecules...
Molecular weight1. The amount of mass in one mole of molecules of a substance as determined by summing the masses of the...
Molecule1. (MOLL-uh-KULE) The smallest division of a compound that still retains or exhibits all the properties of...
MollisolsMollisols commonly are the very dark colored, base-rich, mineral soils of the steppes. Nearly all of these...
Mollusc1. Aquatic invertebrate organisms such as oysters and clams in the phylum Mollusca that typically have a body...
Mollusc body partParts of the body of organisms in the phylum Mollusca
Mollusc footIn mollusks, the structure found on the animal's ventral side, that consists primarily of muscle, and is...
Mollusc valve1. The shell or shells of certain organisms, such as clams, oysters, and snails.
MolluscaA phylum of the kingdom Metazoa. Mollusca have soft, unsegmented bodies with an anterior head, a dorsal...
MolluscicidesKill snails and slugs.
MolluskA phylum of invertebrates that includes bivalves (clams, oysters and mussels), gastropods (snails) and...
Mollusk reefAn area of many shell reefs surrounded and intermixed with channels and unvegetated flats.
MolokaiThe drainage on the island of Molokai; and associated waters. Hawaii. Area = 260 sq.mi.
Molt1. An animal's shedding of its exoskeleton prior to new growth. For example, blue crabs and other crustaceans...
Molten ironIron produced in a blast furnace as measured at the blast furnace, and may include relatively minor amounts...
Molten salt reactorA thermal treatment unit that rapidly heats waste in a heat-conducting fluid bath of carbonate salt.
Molting1. The process of shedding and then regrowing feathers in laying hens. It corresponds with a period of no egg...
MolybdenumTotal molybdenum.
Moment estimates1. A statistical estimation procedure that equates population moments to sample moments.
MonascusA genus in the family Monascaceae, order Eurotiales. One species, Monascus purpureus, has multiple uses in...
MonetizationValuation in monetary (dollar, if in the US or Canada) terms.
Monitor & assure public water supply complianceActivities to monitor the compliance of public water supplies with all applicable national standards and...
Monitor accuracyCloseness of the measurement made by a CEMS to the reference value of the emissions or volumetric flow being...
Monitored natural attenuation1. The term monitored natural attenuation refers to the remedial approach that allows natural processes to...
Monitoring1. Testing that water systems must perform to detect and measure contaminants. A water system that does not...
Monitoring / modeling methods developmentActivities to develop protocols and approaches to enhance the replicability and standardization of scientific...
Monitoring agencyState or local agency responsible for meeting the requirements of this part.
Monitoring and reportingProcesses and activities related to the measurement and collection of environmental data by both regulated...
Monitoring and reporting violationViolation of monitoring and reporting requirements that specify how and when water must be tested for the...

1,782 of 29,894 terms in Environment terminology (MLC-0121). Request the full dataset.