Environment terminology · MLC-0121

Environment terms: T (1,357)

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T 0-50Time interval of a measurement system's response after any step increase to the input between the following...
T 100-50Time interval of a measurement system's response after any step decrease to the input between the following...
T Cell ReceptorHeterodimeric antigen receptors present on the surface of T-cells. Two T-cell antigen receptors have been...
Table 10 Hazardous Air PollutantHAP compound listed in table 10 of this subpart.
Table 8 CompoundCompound listed in table 8 to subpart G of this part.
Table 9 CompoundCompounds listed in Table 9 of subpart G of this part. [40 CFR 63.1101 (CFR 2013)]
Table G-1Provides a list of the Revision Checklists by cluster and specifies the due date for the cluster. The Table...
Table G-2Provides a list of the Revision Checklists in numerical order. The table also lists the title of the federal...
Tabloida page half the size of a broadsheet, or twice the size of a sheet of standard paper.
TachycardiaExcessively rapid heart beat
Tack Specialty CoatingAny thin film epoxy coating applied at a maximum thickness of 2 dry mils to prepare an epoxy coating that has...
Tack-WipeSolvent impregnated cloth used to remove dust from surfaces prior to application of coatings.
Taconite Iron Ore ProcessingIndustrial process that separates and concentrates iron ore from taconite, a low grade iron ore, and heats...
Taeniatherum caput-medusaeIntroduced invasive annual grass. A weed.
TagStiff paper, metal or other hard material that is tied or otherwise affixed to the packaging of a protector.
Tag nameThe physical name of the data element that adheres to EPA's data standards for XML. In almost all cases, this...
Tagged Image File Formata TIFF is a cross-platform graphics file format that is highly used in graphic arts.
Tagliabue Closed CupA standard method of determining flash points.
Tagliabue Open CupA standard method of determining flash points.
TailAn animal's elongated posterior appendage
Tail BandsUsed for marking treated cows. Rubber bands are sometimes used to dock cow's tails.
Tail WaterThe runoff of irrigation water from the lower end of an irrigated field.
Tailings1. Residue of raw material or waste separated out during the processing of crops or mineral ores.
Tailings Closure Plan (Radon)Nuclear Regulatory Commission or Agreement State approved plan detailing activities to accomplish timely...
Tailings PileA pile consisting primarily of any combination of overburden from a mining operation and tailings from a...
Tailings PondSurface impoundment where waterborne mine and mill residues are collected and the solids allowed to settle...
Tailored OrdinancesOrdinances put in place by local governments with broad land use authority to control access to or the use of...
Tailpipe StandardsEmissions limitations applicable to mobile source engine exhausts.
TailraceChannel that carries water away from a dam.
TailwaterIrrigation water that reaches the lower end of a field.
TailwatersThe channel or stream below a dam, often characterized by waters with low dissolved oxygen. Many nonpoint...
Take-All DiseasesFungus of wheat, triticale and several other grasses that causes roots and lower stems to rot.
Take-Home PathwayWhen farmworkers go home after work, they may contaminate their cars and homes with pesticide residues from...
Take-Or-Pay1. A contract provision obligating a purchaser to pay for a commodity whether or not delivery is taken.
Tall Coke Oven BatteryCoke oven battery with ovens 6 meters (20 feet) or more in height.
tallgrass prairieRich and deep soils on which a variety of tallgrasses and flowers grow.
Tallow1. Product made from beef cattle or sheep fat that has a melting point of 40 °C or greater.
talusAn accumulation of rock debris at the base of a cliff.
talus slopesBanks formed by large blocks of rock, up to 10 meters (33 feet) in diameter, that have broken away from the...
Tamarix speciesMost saltcedars, or tamarisks, are deciduous shrubs or small trees growing to 12-15 feet in height and...
TamoxifenOne of the selective estrogen receptor modulators with tissue-specific activities. Tamoxifen acts as an...
Tamper-Evident DeviceDevice which can be visually inspected to determine if a container has been opened.
Tampering1. Adjusting, negating, or removing pollution control equipment on a motor vehicle.
Tamping MethodCompaction is performed by vertically operated tampers.
Tandem Mass SpectrometryMass spectrometers coupled in series. The targeted compound is selectively ionized, and its characteristic...
Tandem ParlorParlor design where cows line up head to tail in individually opening stalls.
Tangentially Fired BoilerBoiler that has coal and air nozzles mounted in each corner of the furnace where the vertical furnace walls...
Tangible Development CostCosts incurred during the development stage for access, mineral-handling, and support facilities having a...
Tangible Net WorthTangible assets that remain after deducting liabilities; such assets would not include intangibles such as...
Tank1. Stationary unit that is constructed primarily of nonearthen materials (such as wood, concrete, steel...
Tank and Ancillary EquipmentTanks and associated pipes, pumps, sumps, manifolds, fittings, flanges, and valves used to distribute, meter...
Tank appurtenancesIn addition to the tank itself, the additional pieces of equipment necessary to bring the tank into service...
Tank Bath StartupWhen the components or relative proportions of the various components in the bath have been altered from the...
Tank BatteryCollection of equipment used to separate, treat, store, and transfer crude oil, condensate, natural gas, and...
Tank CarCar designed to carry liquid freight by rail, and including a permanently attached tank.
Tank Fuel Volume1. Volume of fuel in the fuel tank(s), which is determined by taking the manufacturer’s nominal fuel tank(s)...
Tank OperationTime in which current and/or voltage is being applied to a chromium electroplating tank or a chromium...
Tank SystemHazardous waste storage or treatment tank and its associated ancillary equipment and containment system.
Tank System ComponentEither the tank or ancillary equipment of a tank system. [40 CFR 260.10 (CFR 2013)]
Tank Truck1. Truck and/or trailer used to transport or cause the transportation of gasoline or diesel fuel, that meets...
Tank VehicleAny commercial motor vehicle that is designed to transport any liquid or gaseous materials within a tank that...
Tank VesselAs defined by section 1001 of OPA means a vessel that is constructed or adapted to carry, or that carries...
TankageDried animal by-product residues used in feedstuffs.
TankerAn oceangoing ship designed to haul liquid bulk cargo in world trade.
Tankless Water HeaterThe water is heated at the point of use as it is needed.
TanksStationary devices used to store or treat hazardous waste.
Tap1. Pouring of molten steel from an EAF.
Tap Sampling Protocol1. Instructions given to residents or those sampling on behalf of the water system to conduct tap sampling...
Tap water from food manufacturingWater used in industrial production of foods.
Tapeworm InfectionInfection with a subclass of segmented worms comprising the tapeworms.
Tapping1. Removal of product from the EAF or other reaction vessel under normal operating conditions, such as...
Tapping EmissionSource of air pollutant emissions that occur during the process of removing the molten product from the...
Tapping LocationOpening thru which lead and slag are removed from the furnace.
Tapping StationGeneral area where molten product or slag is removed from the electric submerged arc furnace.
Tar BallDense, black, sticky spheres of hydrocarbons formed from weathered oil.
Tar ballsDense, black, sticky spheres of hydrocarbons formed from weathered oil.
Tar sand1. Swamp-like deposit of a mixture of fine clay, sand, water, and variable amounts of tar-like heavy oil...
TareTo use a container or other reference mass to zero a balance before weighing a sample. Generally, this means...
Target1. An objective (constraint or expected result) set by management to communicate program purpose to operating...
Target ArchitectureDescribes the future (to be) state of the agency in terms of performance, business, data, services, and...
Target CankerPerennial canker produced by a fungus which invades live tissue during the host dormant season, and survives...
Target Distance CategoriesConcentric rings (not necessarily circular) with radii 1/4, 1/2, 1, 2, 3, and 4 miles from the sources at the...
Target Distance LimitMaximum distance over which targets for the site are evaluated. The target distance limit varies by HRS...
Target Distance Limit for the Air Migration PathwayDistance over which population and other targets are evaluated. The target distance limit generally is a...
Target Distance Limit for the Ground Water Migration PathwayThe target distance limit is the distance over which targets are evaluated. For the ground water pathway, the...
Target Distance Limit for the Surface Water Migration PathwayDistance over which the in-water segment of the hazardous substance migration path is evaluated. The target...
Target EffectThe action of a stressor on the intended characteristic of a system
Target, environmentalDetailed performance requirement, quantified wherever practicable, applicable to the organization or parts...
Target Hazardous Air Pollutant1. Compounds of chromium (Cr), lead (Pb), manganese (Mn), nickel (Ni), or cadmium (Cd).
Target Hazardous Air Pollutant Containing CoatingSpray-applied coating that contains any individual target HAP that is an Occupational Safety and Health...
Target Hazardous Air Pollutant Containing MaterialRaw materials, intermediates, or products that contain one or more target HAP. Any material that contains...
Target Hydrocarbon-Bearing Stratigraphic FormationStratigraphic interval intended to be the primary hydrocarbon producing formation.
Target Organ1. The biological organ(s) most adversely affected by exposure to a chemical, physical, or biological agent.
Target PlantAny [plant] for which the pesticide was intended to control.
Target Pollutant1. An attribute of the control strategy that specifies the pollutant that is targeted as the primary interest...
Target Pollutant ReductionThe absolute emissions reduction achieved for the target pollutant.
Target Population1. The population, clients, or subjects intended to be identified and served by the program.
Target VesselVessel which has been declared as waste and will be disposed of by sinking it in the ocean.
Target Wells for Aquifer Being EvaluatedWells that are located within the target distance limits, and completed in the aquifer being evaluated or an...
Target YearAn attribute of the control strategy that specifies the target year for the strategy run. Typically, this is...
Targeted ResearchResearch funded as a result of an institute set aside of dollars for a specific scientific area. Institutes...
Targeted sampling1. Sampling in which sites are allocated to specific locations of concern (e.g., below discharges, in areas...
Targeted Sampling DesignTargeted sampling designs have a purpose other than obtaining random samples from a statistical population...
Tariff1. The schedule of a utility's rates and charges.
Task OrderOrder for services placed against an established contract or with Government sources.
TasselingA condition when the tassel-like male flowers emerge.
Taste, Color, and OdorTaste, color, and odor problems may indicate that pollutants are present; however, these problems are of...
Tax CreditTax Credits allow a special exclusion, exemption, or deduction from gross income or which provide a special...
Tax CreditsTax Credits allow a special exclusion, exemption, or deduction from gross income or which provide a special...
Tax IncentiveFees, charges, and taxes are widely used incentives which generally place a per unit monetary charge (or fee...
Taxa1. a grouping of organisms given a formal taxonomic name such as species, genus, family, etc.
Taxa richnessThe number of distinct species or taxa that are found in an assemblage, community, or sample.
Taxonomy1. The principles of classification and the creation of an ordered system of grouping.
Taxonomy and StrainDefinition of the hazards with respect to traditional biological classification taxonomy and strain...
T-Cell ActivationT-Cell Activation involves stimulation of T lymphocytes by receptor interaction with mitogens or cell...
T-Cell DifferentiationDevelopment of bone marrow-derived stem cells in the thymus through stages of positive selection under the...
T-Cell Differentiation in ThymusProgression of T cell precursors in the thymus through many stages of maturation. These stages include...
T-Cell ProliferationAn increase in the number of all, or specific subsets of, T-cells by cell growth and cell division during an...
t-distribution1. The name given by Gosset (under his pseudonym "Student") to a distribution that arises in the study of...
TeatThe appendage on the udder through which milk from the udder flows.
Teat DipPre and Post-milking Substance that kills bacteria and helps to seal the teat end to prevent entry of...
Teat SealantA product that forms a mechanical barrier on the teat end to protect the teat. Generally used at dry-off...
Tech Transfer & TrainingPrograms and projects that provide targeted information to specific stakeholders on technical or scientific...
Technical Approach for Risk AssessmentOne of the Standard Tools under the RAGS Part D approach. The TARA is a road map for incorporating continuous...
Technical AssessmentThe evaluation process used to measure the performance or effectiveness of a technical system and its...
Technical Assistance1. Support provided to State, tribal, and local jurisdictions when they have the resources but lack the...
Technical Assistance Grant1. An EPA grant awarded to eligible community groups for the purpose of hiring an independent technical...
Technical Assistance GrantsSee http://www.epa.gov/superfund/community/tag/index.htm. A Technical Assistance Grant (TAG) provides money...
Technical Assistance Services for CommunitiesTASC is a national EPA program that provides technical assistance services to communities.
Technical Assistance to Brownfields CommunitiesSee http://www.toscprogram.org/. Technical Assistance to Brownfields Communities (TAB) helps communities to...
Technical ContactA technical representative whom EPA, state, or tribal officials may contact for clarification of the...
Technical ContactsA point-of-contact person assigned to provide assistance to the application developers throughout the entire...
Technical coordinatorThe individual responsible for directing the activities of an individual cross-cutting group.
Technical directorThe individual responsible for directing the activities of an individual resource group.
Technical DocumentDocument of technical nature, usually related to a system (e.g., requirements, best practices, etc.) or a...
Technical EffectDamage to water equipment or reduced effectiveness of treatment for other contaminants
Technical GradeFor purposes of determining if a waste is P or U listed, a commercial chemical product that is not 100...
Technical HarmonizationProcess of harmonizing technical practices of any kind, whether at the national, regional or international...
Technical ImpracticabilityRefers to a situation where cleanup levels associated with final cleanup goals is not practicable from an...
Technical Information Manager1. The person responsible for uploading author manuscripts and other referenced files, adding final citation...
Technical InteroperabilityBits and Bytes of the information exchanged
Technical ModuleA section of this document that provides guidance on conducting a science-based assessment on a set of...
Technical Outreach for CommunitiesSee http://www.toscprogram.org/. Technical Outreach for Communities (TOSC) uses educational and technical...
Technical Outreach Services to Communities1. A grant awarded to a community for technical assistance in dealing with Superfund issues at non-NPL sites...
Technical PotentialThe theoretical maximum amount of energy use that could be displaced by the technology being evaluated (e.g...
TECHNICAL REFERENCE FILESNonrecord copies of articles, periodicals, reports, studies, vendor catalogs, and similar materials that are...
Technical ReviewA documented critical review of work that has been performed within the state of the art. The review is...
Technical Review Workgroup for LeadSee http://www.epa.gov/superfund/health/contaminants/lead/trw.htm. The Technical Review Workgroup for Lead...
Technical Support DocumentNoncompliance Penalties Technical Support Document which accompanies these regulations. The Technical Support...
Technical Support Document Water Quality-Based Toxics ControlTechnical Support Document Water Quality-Based Toxics Control (EPA-505/2-90-001), EPA Office of Water...
Technical Systems Audit1. A thorough, systematic, on-site qualitative audit of facilities, equipment, personnel, training...
Technical-Grade Active IngredientA pesticide chemical in pure form as it is manufactured prior to being formulated into an end-use product...
Technically Feasible Child-Resistant PackagingWhen applied to child-resistant packaging, means that the technology exists to produce the child-resistant...
Technically Prescriptive StandardStandards expressed in terms of the techniques to be applied.
technically prescriptive standardsStandards expressed in terms of the techniques to be applied. See also "performance-based standards."
Technically Qualified Individual1. Person:(1) Who because of his/her education, training, or experience, or a combination of these factors...
Technician1. Any person who performs maintenance, service, or repair that could reasonably be expected to release Class...
TechniciansAny person who performs maintenance, service, or repair that could reasonably be expected to release Class I...
Technologically Enhanced Naturally Occurring Radioactive MaterialRadionuclides that have been concentrated or enhanced as the result of human activity.
Technology AssessmentCollection and evaluation of detailed information on technology performance, applicability, availability, and...
Technology Based Effluent Limitation1. An effluent limit for a pollutant that is based on the capability of a treatment method to reduce the...
Technology Innovation OfficeSee http://www.epa.gov/swertio1/index.htm. The Technology Innovation Office (TIO) of the U.S. Environmental...
Technology standardA pollution control standard that mandates the use of a specific control technology or production process by...
Technology TransferExchange or sharing of knowledge, skills, processes, or technologies across different organizations.
Technology VerificationVerifies the performance of innovative technologies that have the potential to improve protection of human...
Technology-Based Effluent LimitA permit limit for a pollutant that is based on the capability of a treatment method to reduce the pollutant...
Technology-Based Limitations1. Industry-specified effluent limitations applied to a discharge when it will not cause a violation of water...
Technology-Based Standards1. Effluent limitations applicable to direct and indirect sources that are developed on a...
Tectonic Trench1. A narrow, elongate depression of the deep seafloor associated with a subduction zone. These can be...
Tedlar bagsGas-tight bags constructed of non-reactive material (Tedlar) for the collection and transport of gas/vapor...
Telecommunications1. The preparation, transmission, communication, or related processing of information by electrical...
Telecommunications Relay ServiceA free service that enables persons with TTYs, individuals who use sign language and people who have speech...
TeleconnectionA strong statistical relationship between weather in different parts of the globe. For example, there appears...
Telemetry1. (tel-LEM-uh-tree) The electrical link between the transmitter and the receiver. Telephone lines are...
Teleological causation1. Teleological causation is the idea that causes are purposeful.
TeleomorphThe sexual form of a fungus.
TelephoneA user end instrument that is used to transmit and receive voice-frequency signals.
Telephone DirectoriesRefers to telephone directories printed on paper with high ground wood content. Other directories, such as...
TelephonyThe word used to describe the science of transmitting voice over a telecommunications network.
TeletypewriterAn abbreviation for teletypewriter. Machinery or equipment that employs interactive text based communications...
TeleworkA flexible work arrangement where a manager allows an employee to perform his or her professional duties and...
TeliosporeThick-walled resting spore of rust and smut fungi that germinates to form a basidium.
TelnetTelnet is the way you can access someone else's computer, assuming they have given you permission. (Such a...
Telnet ClientThe software that runs on a client (usually a desktop machine) that is used to connect to a server that is...
TelomereThe end of a chromosome, associated with a characteristic DNA sequence that is replicated in a special way. A...
Telomere CappingProcesses that prevent chomosome ends from degradation and from being recognized as a double strand break.
Telomere Length MaintenanceTelomeres in human cancer cells consist of a tandem array of telomeric DNA repeats bound to a specialized...
Telomere MaintenanceTelomere maintenance mechanisms contribute to the maintenance of proper telomeric length and structure by...
Telomere RecombinationRecombination can lead to the net elongation of telomeres. The sequence at the ends of chromosomes is highly...
Telomere ShorteningTelomere Shortening occurs every time linear eukaryotic chromosomes are replicated due to premature stoppage...
TelophaseThe final phase of cell division, in which two daughter nuclei are formed, the cytoplasm divides, and the...
TemazepamA benzodiazepine that acts as a GAMMA-AMINOBUTYRIC ACID modulator and anti-anxiety agent.
Temperature1. Measure of the average speed of motion of the atoms or molecules in a substance or combination of...
Temperature CoefficientRate of increase in an activity or process over a 10 degree Celsius increase in temperature. Also referred to...
Temperature Inversion1. An instance when a warm air layer overlays a cooler air layer in the atmosphere, often suppressing...
Temperature log1. A log of the temperature of the fluids in the borehole; a differential temperature log records the rate of...
Temperature LoggingType of well logging in which the temperature of the borehole is measured and recorded.
Temperature Monitoring Device1. Piece of equipment used to monitor temperature and having an accuracy of ±1 percent of the temperature...
Temperature Pollutant CategoryAll wastewater temperature parameters for measuring wastewater temperature in degrees Fahrenheit and Celsius...
Temperature ProfilerRemote sensing devices that receives electromagnetic or acoustic waves transmitted through, emitted by, or...
Temperature Sensor1. A device that opens and closes a switch in response to changes in the temperature. This device might be a...
TemperingProcess whereby glass is heated near the melting point and then rapidly cooled to increase its mechanical and...
Tempering OvenAny facility used to bake hardboard following an oil treatment process.
Template DNA StrandThe strand of DNA used as the template for the mRNA synthesis.
Temporal GradientA graded change in the magnitude of some quantity or dimension measured over time.
Temporal reference approachReference approach that collects observations during reference time periods.
Temporal ScaleClimate may vary on a large range of temporal scales. Temporal scales may be seasonal to even geological...
Temporal Sequence1. A type of evidence based on the relationship between the time of occurrence of a candidate cause and the...
Temporal variability1. Variability over time, whether long- or short-term.
Temporality1. Causes precede their effects. A particularly cogent explanation of the concept is provided by Renton...
Temporarily Out of UseA tank that is empty or contains product and/or abandoned but not currently in use. (Note: There are release...
Temporary Boiler1. Any gaseous or liquid fuel-fired steam generating unit that is designed to, and is capable of, being...
Temporary Enclosure1. Total enclosure that is constructed for the sole purpose of measuring the fugitive emissions from an...
Temporary Ocean CurrentAn ocean current due to seasonal winds
Temporary OpeningOpening into an enclosure that is equipped with a means of obstruction, such as a door, window, or port, that...
Temporary Protective CoatingCoating applied to provide scratch or corrosion protection during manufacturing, storage, or transportation...
TEMPORARY RECORDSRecords approved by NARA for disposal, either immediately or after a specified retention period. Also called...
Temporary Restraining OrderLegal action by judge to prohibit action by responsible parties.
Temporary SealAny measure, including but not limited to, application of luting or packing material, to stop a collecting...
Temporary Thermal SprayingThermal spraying operation that uses or emits any of the plating and polishing metal HAP, as defined in this...
Temporary Total Enclosure1. Total enclosure that is constructed for the sole purpose of measuring the fugitive emissions from an...
Temporary UnitFor temporary tanks and container storage areas used to treat or store hazardous remediation wastes during...
Temporary Units1. Tanks or storage areas that EPA designated to be used solely for the treatment or storage of remediation...
Temporary Vessel ModificationModification to a vessel based on a written contract for marine services such that the modifications will be...
Ten Year 24-Hour Rainfall Event1. Maximum precipitation event with a probable recurrence interval of once in 10 years as defined by the...
Tender1. Transfer of ownership or physical custody of a volume of gasoline or other petroleum product all of which...
TendonFibrous bands or cords of connective tissue at the ends of skeletal muscle fibers that serve to attach the...
Tennessee RegionThe drainage of the Tennessee River Basin. Includes parts of Alabama, Georgia, Kentucky, Mississippi, North...
TensiometerInstrument used to measure the surface tension of a solution by determining the amount of force needed to...
Tension WoodAbnormal wood found in leaning trees of some hardwood species and characterized by the presence of gelatinous...
ten-to-the-minus-sixthUsed in risk assessments to refer to the probability of risk. Literally means a chance of one in a million...
Tenuazonic AcidAn Alternaria mycotoxin. A poisonous substance generated by certain fungi.
TepidModerately warm; lukewarm
Teragram1 trillion (1012) grams = 1 million (106) metric tons.
Teratogen1. A substance capable of causing birth defects.
Teratogenesis1. The induction of nonhereditary congenital malformations (birth defects) in a developing fetus by exogenous...
Teratogenic1. Structural developmental defects due to exposure to a chemical agent during formation of individual organs.
Teratogenic EffectThe result of processes that negatively affect a developing fetus.
TeratogenicityThe capacity of a physical or chemical agent to cause teratogenesis in offspring.
TermA period of time for which a policy is issued.
Term SheetContractual agreement between the EPA and the project sponsor (and the lender, if applicable) that sets forth...
TerminalA designated area of a port used for the transmission, care and convenience of cargo and/or passengers in the...
terminal electron acceptorA compound or molecule that accepts an electron (is reduced) during metabolism (oxidation) of a carbon...
Terminal Equipment1. Communications equipment at either end of a communications link, used to permit the stations involved to...
Terminal MoraineAn end moraine that marks the farthest advance of a glacier; usually has the form of a massive arcuate or...
TERMINATION1. Permanent withdrawal of the authority to obligate previously awarded grant funds before that authority...
Termination Contracting OfficerRefers to a contracting officer who is settling terminated contracts.
TerminologySet of designations belonging to one special language. [ISO 1087-1:2000] NOTE: A term may contain symbols and...
Terms and ConditionsTerms and conditions governing lawful sale, distribution, and use approved in conjunction with registration...
Terms and Conditions of RegistrationTerms and conditions governing lawful sale, distribution, and use approved in conjunction with registration...
TERMS OF A GRANT OR SUBGRANTAll requirements of the grant or subgrant, whether in statute, regulations or the award document. (40 CFR...
Terne CoatingCoating steel products with terne metal by the hot dip process including the immersion of the steel product...
Terpenes1. Unsaturated hydrocarbons occurring in plant oils and resins, common in conifers.
Terrace1. A low-gradient surface formed by fluvial aggradation or erosion when the stream flowed at a higher...
TerracingDikes built along the contour of sloping farm land that hold runoff and sediment to reduce erosion.
Terrain conductivityGeophysical method in which EM methods measure directly the average electrical conductivity of the ground...
Terrain-Induced WindstormWinds associated with strong downslope winds
TerraneA rock formation or assemblage of rock formations that share a common geologic history. A geologic terrane is...
Terrestrial1. Pertaining to the land.
Terrestrial OrganismAn organism that lives on the land.
Terrestrial Radiation1. The total infrared radiation emitted by the Earth and its atmosphere in the temperature range of...
Terrestrial Sensitive EnvironmentA terrestrial sensitive environment is defined as any area that meets the criteria listed in HRS Table 5-5...
Terrestrial Vegetation Biogenic Emission1. (Emission of Biogenic Hydrocarbons which are) naturally occurring compounds, including VOCs (volatile...
Terrestrial Vertebrate SpeciesVertebrate species that lay eggs or bear young outside of water. Included are all reptiles, all birds, most...
Territorial Seas1. Belt of the seas measured from the line of ordinary low water along that portion of the coast which is in...
TerritorialityThe behavior by which an organism claims an area and defends it against members of its own species
Terror Agent Cleanup TechnologyDecontamination technology for biological/radiological warfare agents
Terrorism1. Systematic use of terror such as bombing, killings, and kidnappings, as a means of forcing some objective.
Tertiary Butyl AlcoholTert-butyl alcohol is a colorless oily liquid with a sharp alcohol odor. Floats and mixes with water...
Tertiary Treatment1. An enhancement of normal sewage treatment operations to provide water of potable quality using further...
Tertiary Wastewater TreatmentSelected biological, physical, and chemical separation processes to remove organic and inorganic substances...
TessellationA pavement or tiling of a space by a mosaic pattern. The EMAP design prescribes a regular tessellation on the...
Test AnalyzerAnalyzer subjected to testing as part of a candidate method in accordance with subparts B, C, D, E, or F of...
Test CompressorCompressor used to demonstrate compliance with the applicable noise emissions standard.
Test CycleRefers to different portions of vehicle emissions testing.
Test Data1. Any information which is a quantitative measure of any aspect of the behavior of a retrofit device.
Test Engine1. Engine in a test sample. [40 CFR 89.502 (CFR 2013)][40 CFR 90.502 (CFR 2013)] [40 CFR 94.2 (CFR 2013)] [40...
Test FacilityFor this subpart, a laboratory that has been set up and calibrated to conduct ANSI Std S3.19-1974 tests on...
Test FleetEngine or group of engines that a manufacturer uses during certification to determine compliance with...
Test Hearing ProtectorHearing protector that has been selected for testing to verify the value to be put on the label, or which has...
Test LocomotiveLocomotive or locomotive engine in a test sample. [40 CFR 92.2 (CFR 2013)]
Test Locomotive Engine1. Locomotive or locomotive engine in a test sample.
Test Marketing1. Distribution in interstate commerce of a substitute to no more than a limited, defined number of potential...
Test Method1. An adoption of a scientific technique for a specific measurement problem, as documented in a laboratory...
Test Method Major ChangeModification to a federally enforceable test method that uses “unproven technology or procedures” (not...
Test Method Minor ChangeA modification to a federally enforceable test method that:(i) Does not decrease the stringency of the...
Test Method RepeatabilityAmount of random error which is expected to affect the results obtained for a given test substance, when the...
Test Mode1. A distinct combination of engine speed and load for steady-state testing.
Test OrderOrder to develop information pursuant to section 4(a) of the Act.
Test Particulate Matter SamplerPM 10 sampler, PM 2.5 sampler, or PM 10-2,5 sampler subjected to testing as part of a candidate method in...
Test ProcedureTest protocol.
Test Product1. Any product that must be tested according to regulations published under part 211.
Test ProtocolPlan and procedures which are to be followed in conducting a test.
Test RequestRequest submitted to the manufacturer by the Administrator that will specify the hearing protector category...
Test Rule1. Regulation ordering the development of data on health or environmental effects or chemical fate for a...
Test Sample1. Collection of engines selected from the population of an engine family for emission testing. [40 CFR...
Test Sample Size1. Number of compressors of the same configuration in a test sample.
Test Substance1. Substance or mixture administered or added to a test system in a study, which substance or mixture:(1) Is...
Test System1. Any animal, microorganism, chemical or physical matrix, to which the test, control, or reference substance...
Test System Carrier1. As defined in § 80.2(t).
Test Vehicle1. Vehicle in a test sample.[40 CFR 1037.801 (CFR 2013)]
Test Vehicle Weight1. Vehicle weight used or represented during testing.
Test Weight Basis1. Basis on which equivalent test weight is determined in accordance with §86.129-94 of subpart B of this...
Testing AgentAny person who develops test data on a retrofit device.
Testing BiasBias and foreknowledge introduced to participants as a result of a pretest. The experience of the first test...
Testing Exemption1. Exemption which may be granted under § 89.1004(b) for the purpose of research investigations, studies...
Testing FacilityPerson who actually conducts a study, i.e., actually uses the test substance in a test system. “Testing...
Testing Part, Assembly, or Complete UnitApplying thermal, electrical, mechanical, hydraulic, or other energy to determine the suitability or...
Testis1. Either of the paired male reproductive glands that produce the male germ cells and the male hormones.
TestosteroneA potent androgenic steroid and major product secreted by the leydig cells of the testis. Its production is...
Test-retestAdministration of the same test instrument twice to the same population for the purpose of assuring...
Tests of SignificanceAn evaluation of a null hypothesis that there is no relationship between two variables or no difference...
TetanicPertaining to or of the nature of tetanus, a disease characterized by muscle spasm
Tethered Gas CapGas cap that is loosely but permanently connected to the fuel tank.
TetrachloroethylenePlease see the ATSDR fact sheet for PERC.
Tetraethylene GlycolMolecular Formula: C8H18O5 Tetraethylene glycol is a colorless to straw-colored liquid with a mild odor...
Tetrakis Hydroxymethyl Phosphonium SulfateC8H24O12P2S. A corrosion inhibitor and anti-scaling agent.
Tetramethyl Ammonium ChlorideC4H12ClN. A quaternary ammonium salt and high production volume chemical with multiple uses.
Texas Coastal Prairie WetlandsFreshwater wetlands that occur as a mosaic of depressions, ridges, intermound flats, and mima mound wetlands...
Texas SO2 Trading Program Allowance DeductionPermanent withdrawal of Texas SO2 Trading Program allowances by the Administrator from a compliance account...
Texas-Gulf RegionThe drainage that discharges into the Gulf of Mexico from and including Sabine Pass to the Rio Grande Basin...
Text ClusteringWhen a large set of search results are returned after a query, text clustering can sort the results by...
TEXT DOCUMENTSIn electronic records, narrative or tabular documents, such as letters, memorandums, and reports, organized...
Text MiningText mining is the parsing of text to find patterns and the analysis of those patterns either qualitatively...
Text TelephoneA machine that employs graphic communication in the transmission of coded signals through a wire or radio...
Textile FiberglassFibrous glass in the form of continuous strands having uniform thickness.
Textile Industry ChemicalChemicals used in the process of making textiles including fabric finishers and textile dyes.
Textile ManufacturingEstablishments that transform a basic fiber (natural or synthetic) into a product, such as yarn or fabric...
Textile MillTextile mills are engaged principally in: receiving and preparing fibers transforming these materials into...
Textile SubstrateBase material made of cloth on which a design is printed.
TextilesRefers to fibers from discarded apparel, furniture, linens (sheets and towels), and carpets. Examples of...
TEXTUAL RECORDSThe term usually applied to manuscript and typescript paper records, as distinct from electronic...
Texture CoatRough coat that is characterized by discrete, raised spots on the exterior surface of the part. This...
Thallium and Thallium CompoundsIncludes any unique chemical substance that contains thallium as part of that chemical's infrastructure.
Thallium Compounds (1.0)Includes any unique chemical substance that contains thallium as part of that chemical's infrastructure.
ThallusUndifferentiated vegetative tissue found in some algae, fungi, liverworts and lichens which is characteristic...
Thalweg1. Deepest part of a stream channel.
ThalwegsLongitudinal outline/trace/survey of a deepest part of riverbed from source to mouth (upstream/downstream)...
ThamnidiumOne of the most common molds found on meat and poultry. These molds can also be found on many other foods.
The Bioterrorism Preparedness and Response Act of 2002This Act requires every community water system that serves a population of greater than 3,300 persons to: 1...
The Code of Federal RegulationsThe legal code formed by rules published in the Federal Register by executive departments and agencies of the...
The Food Quality Protection ActThe Food Quality Protection Act was enacted on Aug. 3, 1996 to ensure the safety of food in the United...
TheileriaA genus of tick-borne protozoa parasitic in the lymphocytes, erythrocytes, and endothelial cells of mammals...
TheileriosisInfection of cattle, sheep, or goats with protozoa of the genus Theileria. This infection results in an acute...
Theoretical Maximum Residue ContributionThe theoretical maximum amount of a pesticide in the daily diet of an average person. It assumes that the...
Theory FailureThe program is implemented as planned but its services do not produce the immediate effects on the...
Therapeutic Index1. The ratio of the dose required to produce toxic or lethal effect to dose required to produce nonadverse or...
Therm1. A therm equals 100,000 British thermal units.
Thermal Catalytic OxidizerSystem which includes a catalyst to catalyze the transformation of the VOC and HAP in the exhaust into carbon...
Thermal Chip DryerDevice that uses heat to evaporate oil or oil/water mixtures from unpainted/uncoated aluminum chips...
Thermal Control CoatingCoatings formulated with specific thermal conductive or radiative properties to permit temperature control of...
Thermal CrackingThe breaking up of heavy oil molecules into lighter fractions by the use of high temperature without the aid...
Thermal CuttingCutting, slotting, or piercing a part using an oxy-acetylene oxygen lance, electric arc cutting tool, or...
thermal desorberDescribes the primary treatment unit that heats petroleum-contaminated materials and desorbs the organic...
thermal desorption systemRefers to a thermal desorber and associated systems for handling materials and treated soils and treating...
Thermal Desorption-Gas Chromatography/Mass SpectrometryMultistep procedure in which surface molecules are desorbed by heating the surface, separated by passing them...
Thermal Dryer1. For units constructed, reconstructed, or modified on or before May 27, 2009, any facility in which the...
Thermal EnergyThermal output produced by a combustion source used directly as part of a manufacturing process but not used...
Thermal Energy Load1. Amount of matter or thermal energy that is introduced into a receiving water; to introduce matter or...
Thermal Energy TransferTransfer of heat between a system and its surroundings
Thermal Expansion1. The increase in volume of a material as it gets warmer. For example, water expands as it is heated...
Thermal Expansion Relief ValvePressure relief valve designed to protect equipment from excess pressure due to thermal expansion of blocked...
Thermal Imaging DeviceRemote sensing system that can be used to detect leaking gas compounds such as methane and benzene.
Thermal InfusionUses heat to infuse metal powder or dust onto the surface of a part. Typically, thermal infusion is a dry...
Thermal InsulationMaterial which inhibits heat transmission, usually referring to preventing heat entering or leaving buildings.
Thermal mass materialsMaterials that retain or store heat produced by sunlight or other sources. These are typically dense...
Thermal neutronA neutron that is in equilibrium with the surrounding medium such that it will not change energy (average...
Thermal Oxidation SystemCombustion device used to mix and ignite fuel, air pollutants, and air to provide a flame to heat and oxidize...
Thermal Oxidizer1. Control system that combusts or oxidizes exhaust gas from a process unit. Thermal oxidizers include...
Thermal Pollution1. Discharge of heated water from industrial processes that can kill or injure aquatic organisms.
Thermal ProcessAny process primarily using the application of heat to make a product.
Thermal Process UnitIn manufacturing an operating unit integral to production which uses heat in making the product.
Thermal ReactorHot surface in the engine exhaust system that has the effect of significantly lowering emissions of one or...
Thermal RecoveryWell stimulation process which introduces heat into a resource reservoir.
Thermal RemediationThe use of elevated temperatures to treat hazardous wastes, e.g. pyrolysis, incineration.
Thermal Spray Aluminum SealantAny epoxy coating applied to thermal spray aluminum surfaces at a maximum thickness of 1 dry mil.
Thermal SprayingAlso referred to as metal spraying or flame spraying, a process that uses or emits any of the plating and...
Thermal Stratification1. (STRAT-uh-fuh-KAY-shun) The formation of layers of different temperatures in a lake or reservoir.
Thermal Stress AnomalyAn area of the ocean surface which is experiencing warmer sea surface temperatures (SSTs) than the typical...
Thermal Synthetic ProcessMakes phosphoric acid by burning elemental phosphorus in air and hydrating the product.
Thermal System Insulation1. Means material in a school building applied to pipes, fittings, boilers, breeching, tanks, ducts, or other...
Thermal System Insulation Asbestos-Containing MaterialThermal system insulation that is Asbestos-Containing Material.
Thermal Treatment1. Use of elevated temperatures to treat hazardous wastes.(See: incineration; pyrolysis.)
Thermal Treatment ProcessNon-pressurized wood treatment process where the wood is exposed to a heated preservative.
Thermally Driven CirculationA diurnally reversing closed cellular wind current resulting from horizontal temperature contrasts caused by...
Thermocline1. (THUR-moe-KLINE) The middle layer in a thermally stratified lake or reservoir. In this layer there is a...
ThermocoupleA heat-sensing device made of two conductors of different metals joined at their ends. An electric current is...
Thermoduric BacteriaBacteria capable of surviving high temperatures, especially those of pasteurization.
Thermoelectric Power Water UseWater used in the process of the generation of thermoelectric power. Power plants that burn coal and oil are...
ThermographRecording instrument that gives a continuous trace of temperature with time.
Thermohaline Circulation1. Large-scale density-driven circulation in the ocean, caused by differences in temperature and salinity. In...
Thermohaline EddyEddy formation due to the interaction of temperature and salinity differences between two water masses...
ThermometerInstrument used to measure temperature.
Thermophile1. Bacteria requiring high temperatures for normal development.
ThermophilicOperationally between 110°F and 140°F (43°C and 60°C).
Thermoplastic Coating Repair and Maintenance1. Any vinyl, chlorinated rubber, or bituminous resin coating that is applied over the same type of existing...
Thermoplastic ProductOne of the following types of products:(1) ABS latex;(2) ABS using a batch emulsion process;(3) ABS using a...
Thermoplastic Product Process UnitCollection of equipment assembled and connected by hard-piping or ductwork, used to process raw materials and...
Thermoplastic ResinThermoplastic resins (or thermoplastics) are plastic resins that will repeatedly become soft when heated and...
Thermoplastic Rubber Coating and MasticCoating or mastic formulated and recommended for application to roofing or other structural surfaces and that...
Thermoset ResinThermoset resins (or thermosets) undergo a chemical reaction and become permanently solid when heated...
Thermosphere1. The atmospheric shell extending from the top of the mesosphere to outer space. It is a region of more or...
Thermostat1. A temperature control device that contains metallic mercury in an ampule attached to a bimetal sensing...
ThiamethoxamA systemic neonicotinoid insecticide
Thiamine PyrophosphateThe coenzyme form of Vitamin B1 present in many animal tissues. It is a required intermediate in the pyruvate...
ThiazolesChemicals with a 5-membered aromatic ring structure with 1 nitrogen and 1 sulfur heteroatoms.
Thicket1. A thick, tangled growth of shrubs, bushes and/or small trees.
Thiessen Polygon AnalysisA method of spatial statistics in which an area is subdivided into subregions, or polygons, in order to...
ThighA part of the lower limb, located between hip and knee.
Thin Layer ChromatographyChromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel...
Thin Medium-Density FiberboardMedium-density fiberboard that has a thickness less than or equal to 8 millimeters or 0.315 inches.
Thinner1. Any solvent used to reduce the viscosity or solids content of a coating.
thinningA tree removal practice that reduces tree density and competition between trees in a stand. Thinning...
Thinning RatioVolumetric ratio of thinner to coating, as supplied.
thin-walled tube samplersA thin-walled non-sealed soil sampling tool used to collect undisturbed soil samples. Used in unconsolidated...
Thioglycolic AcidThioglycolic acid is a colorless liquid with an unpleasant odor. Density 1.325 g / cm3. Used to make...
Third Party1. A party that is not a party to the insurance policy. Parties to the policy are typically the insurer and...
Third Party ApplicatorApplicator of critical use methyl bromide who fumigates or treats commodities, structures, crops, or land on...
Third Party Certified or Verified1. When an entity is assessed against a standard by an independent (third party) organization that is...
THIRD PARTY IN KIND CONTRIBUTIONS1. The value of non cash contributions provided by non Federal third parties. Third party in kind...
Third Party InsuranceProtection of the insured against liability for damage to or destruction of the bodies or property of others.
Third-Party AuditCompliance audit conducted pursuant to the requirements of § 68.59 and/or § 68.80, performed or led by an...
Third-Party CertifierConformity assessment body that provides both product certification services and laboratory testing services...
Third-party TMDLA TMDL in which an organization or group other than the lead water quality agency or organization takes...
Thoracic CavityThe cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the...
Thoracic Wall1. The total system of structures outside the lungs that move as a part of breathing; it includes all...
Thorax1. The division of the body lying between the neck and the abdomen.
Threaded ConnectorThreaded pipe fitting where the threads are cut on the pipe wall and the fitting requires only two pieces to...
ThreatcastingConceptual framework and process that enables multidisciplinary groups to envision potential future threats...
ThreatenedA species that is likely to become endangered if not protected.
Threatened Animal Species1. Those species that may soon become endangered are called threatened species.
Threatened Plant Species1. Those species that are listed as endangered or threatened under section 4 of the Endangered Species Act.
Threatened Species1. A plant or animal that is likely to become endangered if not protected.
Threatened waterbody1. Any waterbody of the United States that currently attains water quality standards, but for which existing...
Three-Dimensional ModelMathematical model defined along three spatial coordinates where the water quality constituents are...
Three-Piece Aerosol CanSteel aerosol can formed by the three-piece can assembly process manufactured to contain food or nonfood...
Three-Piece Can AssemblyProcess of forming a flat metal sheet into a shaped can body which may include the processes of necking...
Three-Piece Food CanSteel can formed by the three-piece can assembly process manufactured to contain edible products and designed...
Three-Process Operation FacilityFacility including those processes involved with plate stacking, burning or strap casting, and assembly of...
Three-Stage TopcoatTopcoat composed of a pigmented basecoat, a midcoat, and a transparent clearcoat.
three-zone buffer systemA technique for establishing a buffer, consisting of inner, middle, and outer zones. The zones are...
Threshold1. The dose or exposure below which no deleterious effect is expected to occur.
Threshold ConcentrationA concentration above which some effect (or response) will be produced and below which it will not.
Threshold DoseDose below which a specified biological effect does not occur, generally for a particular population. Hence...
threshold effect1. An effect (usually an adverse health effect) for which there is an exposure level below which the effect...
Threshold Effects ConcentrationA concentration in media (surface water, sediment, soil) to which a plant or animal is exposed, above which...
Threshold Effects LevelA chemical concentration in some item (dose) that is ingested by an organism, above which some effect (or...
Threshold LevelTime-weighted average pollutant concentration values, exposure beyond which is likely to adversely affect...
Threshold LevelsTime-weighted average pollutant concentration values, exposure beyond which is likely to adversely affect...
Threshold Limit Value1. The concentration of an airborne substance that a healthy person can be exposed to for a 40-hour work week...
Threshold Limit Values1. Guidelines recommended by the American Conference of Governmental Industrial Hygienists.
Threshold MapThe threshold maps are a compilation of the various EJ indexes or the various supplemental indexes on a...
Threshold MapsThe threshold maps are a compilation of the various EJ indexes or the various supplemental indexes on a...
Threshold OdorThe minimum odor of a water sample that can just be detected after successive dilutions with odorless water.
Threshold Odor NumberThe greatest dilution of a sample with odor-free water that still yields a just-detectable odor.
Threshold Planning Quantity1. A quantity designated for each chemical on the list of extremely hazardous substances that triggers...
Threshold QuantityQuantity specified for regulated substances pursuant to section 112(r)(5) of the Clean Air Act as amended...
Threshold Real-Ear ProtectionMean value in decibels of the occluded threshold of audibility (hearing protector in place) minus the open...
Threshold Toxicant1. A substance showing an apparent level of effect that is a minimally effective dose, above which a response...
ThrombocytopeniaDecrease in the number of blood platelets
Thromboxane Activity InductionThrough increased production or release, or inhibited degradation, Thromboxane Activity Induction involves...
Thromboxane Activity InhibitionThrough decreased production and release, or enhanced degradation, Thromboxane Activity Inhibition involves...
Thromboxane DegradationThromboxane Degradation consists of conjugation, transport, and/or oxidation of widely distributed compounds...
Thromboxane ProductionThromboxane Production consists of synthesis of widely distributed compounds formed by cyclooxygenase from...
Throttle1. Component, or components, which either directly or indirectly controls the fuel flow to the engine.
Throttle NotchDiscrete throttle position for a locomotive with a limited number of throttle positions.
Throttle Notch HorsepowerBrake horsepower output of an engine corresponding to each throttle notch position, including dynamic-brake...
Throttle Notch SpeedSpeed of the engine, expressed as the number of revolutions of the crankshaft per unit of time (e.g., rpm)...
Through StreetStreets that go through other major community streets
Throughput1. The number of cows that can be milked in a parlor in a given period of time.
Thrust BlockA mass of concrete or similar material appropriately placed around a pipe to prevent movement when the pipe...
thrust/pullback capacityA measure (in pounds) of how much force a horizontal directional drill rig is able to apply when pushing or...
Thumbnail PicturesA thumbnail picture is a small version of a larger graphic. The typical size of these pictures is often in...
Thunderstorm1. A storm with lightning and thunder, produced by a cumulonimbus cloud, usually producing gusty winds, heavy...
ThylakoidMembranous cisternae of the chloroplast containing photosynthetic pigments, reaction centers, and the...
Thymic T-Cell SelectionBone marrow-derived stem cells in the thymus become educated to recognize complexes of self-major...
ThymineOne of the four bases in DNA that make up the letters ATGC, thymine is the "T". The others are adenine...
Thymus Gland1. An organ that is part of the lymphatic system, in which T lymphocytes grow and multiply. The thymus is in...
Thyroid Gland1. A gland located beneath the voice box (larynx) that produces thyroid hormone. The thyroid helps regulate...
Thyroid HormonesA hormone that affects heart rate, blood pressure, body temperature, and weight. Thyroid hormone is made by...
Thyroid NeoplasmTumors or cancer of the thyroid gland.
Thyroid-Disrupting AgentSubstances found in the environment that can cause abnormal function of the thyroid gland in humans and...
ThyroxineThe major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines...
Ti (Timed Exposure)Duration in hours of the exposure at the concentration Ci.
Tidal amplitudeThe difference in elevation between mean sea level and high or low tide.
Tidal and Ocean Current EnergyTidal and ocean current energy can be exploited by: (1) building semi-permeable barrages (dam-like...
Tidal ChannelLinear or sinuous body of water through which ebb-and-flood tidal movement takes place. Smaller tidal creeks...
Tidal Channel/CreekLinear or sinuous body of water through which ebb-and-flood tidal movement takes place. Smaller tidal creeks...
Tidal CreekLinear or sinuous body of water through which ebb-and-flood tidal movement takes place. Smaller tidal creeks...
Tidal Current1. A current accompanying tides.
tidal currentsThe horizontal movement of ocean water caused by gravitational interactions between the Sun, Moon and Earth...
tidal datumA baseline elevation used as a vertical point of reference from which heights or depths can be reckoned...
Tidal Flat1. (SMP) Marshy or muddy areas of the seabed which are covered and uncovered by the rise and fall of tidal...
Tidal FlowAdvective flow resulting from tidal movement, often amplified in velocity when moving through an inlet, pass...
Tidal FreshSalinity regime with 0-0.5 parts per thousand salinity.
tidal freshwater marshA marsh along a river or estuary, close enough to the coastline to experience significant tides by nonsaline...
Tidal FrontA front created by the linear convergence of two water masses brought into juxtaposition by tidal action...
tidal inlet1. An opening in the shoreline through which water penetrates the land, thereby providing a connection...
Tidal Marsh1. Low, flat marshlands traversed by channels and tidal hollows, subject to tidal inundation; normally, the...
Tidal mud flatThe unvegetated area of shore that is exposed during low tide.

1,357 of 30,736 terms in Environment terminology (MLC-0121). Request the full dataset.