Industrial and trades terminology · MLC-0113

Industrial and trades terms: D (447)

• DThe symbol for density in the context of photographic and printing processes, representing the logarithm of...
• D2MDirect-to-mobile, a broadcast technology that delivers video and other content straight to smartphones from a...
• DACAn electronic device that transforms digital data into an analog electrical signal. It takes a binary input...
• DadoA rectangular groove cut across the grain of a piece of wood, designed to receive the end or edge of another...
• DailyA vehicle used every day for ordinary transportation such as commuting and errands, short for daily driver...
• Daily driverA vehicle used for regular everyday transport, as opposed to a project, show or weekend car. By extension...
• Daily-ableDescribing a vehicle that possesses the characteristics necessary for reliable and practical everyday use...
• Dairy cakeA dense, dry, high-energy supplemental feed formulated for dairy cattle, compressed into a block, cube, or...
• Dairy farmerAn individual engaged in the raising of dairy cattle for the production of milk and dairy products. This...
• Daisy chainA wiring scheme in which multiple devices are connected in sequence, with each device connected to the next...
• Daisywheel printerAn impact printer that uses a print mechanism with characters arranged on spokes radiating from a hub...
• DakotaThe name given by the British Royal Air Force to the Douglas C-47 Skytrain, a military transport aircraft...
• DAMNA mobile robot control architecture, short for Distributed Architecture for Mobile Navigation, in which...
• DampAny hazardous or asphyxiating gas found in a mine, other than normal atmospheric air. The term is a general...
• Damp courseA continuous horizontal barrier of waterproof material built into the lower part of a masonry wall to prevent...
• Damp proofingA treatment applied to a surface or structure, typically the exterior of a foundation wall, to resist the...
• DampingThe dissipation of energy in an oscillating system, which reduces or prevents vibration by converting kinetic...
• DandyA small, unpowered railway truck or cart, historically used to transport horses or workers along a line. In...
• Dandy cartA small, unpowered railway vehicle formerly used to transport a horse that had just pulled a train up an...
• DangerThe stop indication of a railway signal, shown by a red light or a horizontal semaphore arm. A signal...
• Danger signalA railway signal indication that requires a train to stop immediately before passing the signal. This signal...
• DapA notch or recess cut into a timber or beam to receive another structural member, creating a strong...
• Dark territoryA section of railway line not equipped with automatic block signals or centralized traffic control. Train...
• DarlingtonA configuration of two bipolar junction transistors connected in such a way that the current amplified by the...
• Darlington pairA compound structure consisting of two bipolar junction transistors connected in series, where the emitter...
• DarnTo repair a hole or tear in fabric by weaving new threads across the damaged area. This technique involves...
• DartA shaped tuck sewn into a piece of fabric to provide contour and fit, particularly in garment manufacturing...
• Darth VaderAn informal British railway nickname for the Class 460, an electric multiple unit built by Alstom for the...
• DartingThe process of creating darts in a garment to achieve a specific shape or fit. This involves marking...
• DashcamA dashboard camera, a small, self-contained video recorder mounted on the dashboard or windshield of a...
• DATAn abbreviation for Digital Audio Tape, a magnetic tape format for recording digital audio signals. It uses a...
• DataQuantities, characters, or symbols on which operations are performed by a computer or other electrical...
• Data rateThe speed at which data is transferred from one device or location to another through a communication...
• Data setA collection of related data organized into a structured format for storage, retrieval, and analysis. This...
• Data terminal equipmentA device that serves as an endpoint in a data communication system, converting user information into signals...
• DatapadA portable electronic device designed for data entry, display, and sometimes processing in industrial or...
• Datex2A standardized data exchange protocol for sharing traffic and travel information between management centers...
• DatumA reference surface or system against which all measurements in a survey are made, providing a consistent...
• DaughterboardA circuit board that plugs into a larger, main circuit board, extending its functionality or adding...
• DavitA small crane-like device, often found on ships or offshore platforms, used for lowering and raising...
• Davy lampA type of safety lamp invented by Sir Humphry Davy for use in coal mines, designed to detect the presence of...
• Dawes resolution limitAn empirical criterion for the smallest angular separation at which a telescope lets an observer see two...
• Dawn chorusA natural very low frequency radio emission that sounds like birdsong when converted to audio, produced in...
• Day letterA telegraphic message service that offered a lower rate than a standard full-rate telegram in exchange for...
• Day levelA horizontal or nearly horizontal tunnel, also called an adit, driven from the surface into a hillside to...
• DaycoachA type of passenger car designed for daytime travel, offering seating for multiple passengers in an open...
• DBAn abbreviation for Dynamic Brake, a system on diesel-electric or electric locomotives that uses the traction...
• DcAn abbreviation for double crochet, one of the fundamental stitches in crocheting. To create the stitch, the...
• DCEData Circuit-terminating Equipment, which is a device that provides the physical connection to a data...
• DCFCA method of rapidly recharging an electric vehicle battery by supplying direct current from an external...
• DCHA transport channel in UMTS and WCDMA mobile telecommunication systems used for transmitting user data and...
• DCIMA category of software, hardware, and services known as Data Center Infrastructure Management, used to...
• DCTA Dual-Clutch Transmission, an automated manual transmission that uses two separate clutches for odd and even...
• DDAn abbreviation for daily driver, a vehicle used every day for commuting and errands instead of being kept...
• DDDAn abbreviation for Direct Distance Dialing, a telephone service that allows a caller to directly dial...
• DDIAn integrated management framework for three core network services: Domain Name System (DNS), Dynamic Host...
• DDRDouble Data Rate, a technology used in synchronous dynamic random-access memory (SDRAM) that transfers data...
• DDSDirect Digital Synthesis, a method for generating analog waveforms (such as sine waves, square waves, or...
• Dead airA volume of air that remains stagnant or trapped within an enclosed space, preventing effective ventilation...
• Dead doorA storm shutter fitted to the outside of the quarter-gallery door of a sailing ship, closed in heavy weather...
• Dead endA mine working that has been driven to its full extent and has no further access or connection to other parts...
• Dead furrowA depression left in a field after plowing, formed where two adjacent furrows are turned away from each...
• Dead groundRock or material encountered during mining that contains no valuable minerals or is uneconomical to extract...
• Dead in the trainDescribing a locomotive that is part of a train consist but is not actively providing tractive effort or...
• Dead loadThe static, permanent weight of a structure itself, including all fixed components such as walls, floors...
• Dead man's handleA safety device on trains, trams, or other machinery that requires continuous pressure from the operator to...
• Dead sectionA short segment of electrified railway track or overhead line that is intentionally not supplied with...
• Dead standAn area of forest where the majority of trees have died due to factors such as insect infestation, disease...
• Dead weightThe inherent weight of a railway car or locomotive itself, excluding any payload or passengers. This mass...
• Dead zoneAn area within a communication network or system where signal reception is weak or nonexistent, resulting in...
• Dead-air spaceA confined pocket of air that is intentionally trapped within a building assembly, such as between layers of...
• DeadbandA range of input values for which a control system or sensor produces no output or response. This intentional...
• Dead-bugA method of assembling electronic circuits where components are mounted upside down with their leads pointing...
• DeadheadTo operate a truck or piece of agricultural equipment, such as a combine or tractor, without carrying a load...
• DeadlegA section of piping or tubing that has no flow or very infrequent flow, often extending from a main line...
• DeadmanA buried anchor, typically a timber, concrete block, or other heavy object, used to provide stability or...
• DeadmeltA condition in steelmaking where the molten metal has been thoroughly deoxidized, resulting in a calm and...
• DeadsWaste rock or barren material extracted during mining operations that does not contain economically viable...
• Deadstick landingAn emergency landing performed by an aircraft without engine power. The pilot must glide the aircraft to a...
• DebarkTo remove the bark from a log or tree, either manually or mechanically. This process prepares timber for...
• DebindTo remove the binder material from a 'green' part, which is a component formed by processes like metal...
• DebinderA substance or process used to remove the binder from a 'green' part created through powder metallurgy or...
• DebismuthizationThe pyrometallurgical process of removing bismuth impurities from lead bullion. This refining step is...
• DebounceTo eliminate spurious electrical signals generated by mechanical switches as their contacts make and break...
• DebugTo identify, locate, and correct faults or errors, known as bugs, in electronic hardware, firmware, or...
• DecaampereA unit of electric current equal to ten amperes, based on the SI prefix 'deca'. While not as frequently used...
• DecadeA unit of frequency ratio, representing a factor of ten difference between two frequencies. It is commonly...
• Decade boxA test instrument containing a series of precision resistors, capacitors, or inductors that can be switched...
• Decade counterA digital counter circuit designed to count through ten distinct states, returning to its initial state after...
• DecagramA unit of mass in the metric system, equivalent to ten grams. This measurement is applied when weighing...
• DecakatalA unit of catalytic activity equal to ten katals. The katal is the SI unit for catalytic activity...
• DecametreA unit of length in the metric system equal to ten metres. Although less common in everyday industrial...
• DecapodA steam locomotive with a 2-10-0 wheel arrangement, meaning it has two leading wheels, ten driving wheels...
• DecasecondA unit of time equal to ten seconds. This measurement is used for timing events of moderate duration, such as...
• DecayA progressive loss of airspeed in flight, as when a pilot holds the same pitch attitude after reducing power...
• DecentreTo place an optical element, such as a lens or mirror, away from its ideal centre, so that its axis is...
• DeciampA unit of electric current equal to one-tenth of an ampere, or 100 milliamperes, with the symbol dA. It...
• DeciampereA unit of electric current equal to one-tenth (10^-1) of an ampere. It represents a measure of the flow of...
• DecigramA metric unit of mass equal to one-tenth of a gram (0.1 g), with the symbol dg. While a standard decimal...
• DecikatalA unit of catalytic activity, representing one-tenth of a katal. This measurement quantifies the rate at...
• DecilitreA unit of volume equal to one-tenth (10^-1) of a liter. It is frequently used in chemistry, medicine, and...
• DecimetreA unit of length in the metric system, equal to one-tenth of a metre. This measurement is commonly used for...
• DecisecondA unit of time equal to one-tenth of a second (0.1 s), with the symbol ds. It is a standard decimal...
• Deck overTo cover an open area or structure with a flat surface, such as a platform or floor. This action creates an...
• DecollimationThe process or state of light rays losing their parallel alignment after having been collimated. This occurs...
• DecreaseTo become or make smaller in amount, size, or number. In knitting and crochet it means to reduce the number...
• DECTDigital Enhanced Cordless Telecommunications, a digital radio technology standard primarily used for cordless...
• De-electrifyTo remove the overhead lines or third rail systems that provide electrical power to trains on a specific...
• De-emphasisA process in audio and radio systems that reduces the amplitude of high-frequency components in a signal...
• DEFDiesel Exhaust Fluid, an aqueous urea solution used in selective catalytic reduction (SCR) systems to reduce...
• DefaultA pre-selected value or setting that a system or device uses when no other input is provided by the user or...
• DefocusThe state where an optical system is adjusted so that light rays from a point object do not converge...
• DeformationA change in the shape or size of an object due to an applied force, a change in temperature, or other...
• DegreeA unit of angular measurement, representing 1/360th of a full circle, used to quantify horizontal and...
• Delay lineA component designed to introduce a specific time delay into an electrical signal or acoustic wave. This...
• DeleaturA proofreader's mark, resembling a stylized 'd' or a loop, indicating that something should be deleted from...
• DeltaThe central angle of a circular curve, measured between the initial and final tangent lines at their point of...
• Delta connectionA type of three-phase electrical connection where the ends of the three windings are connected to form a...
• Delta wingA type of aircraft wing characterized by its triangular shape, resembling the Greek letter delta, with a wide...
• Delta-vA measure of the change in velocity that a spacecraft or aircraft can achieve, representing its propulsive...
• DelugeA fire suppression system that discharges a large volume of water or other extinguishing agent simultaneously...
• Deluge gunA high-capacity nozzle used in firefighting to deliver a large stream of water over a considerable distance...
• Demand-drivenDescribing production that is planned around actual customer orders and changing demand rather than around...
• Demarc extensionThe wiring that extends the network interface device (NID) or demarcation point from its original location to...
• DemateTo separate two assemblies that were joined, such as a spacecraft from its launch vehicle, an orbiter from...
• DemisabilityThe characteristic of a spacecraft or its components to break up and burn up completely upon re-entry into...
• DemisableDescribing a spacecraft or its components that are designed to disintegrate and burn up entirely during...
• DemixTo separate individual components from a mixed signal, often in audio or video processing. This involves...
• Demon dialingA method employed by automated systems to repeatedly dial a telephone number until a connection is...
• Demonstration gardenA plot of land used to showcase specific agricultural techniques, crop varieties, or management practices to...
• DemultiplexTo separate a single input signal, which contains multiple distinct data streams, into its original...
• DemultiplexerA device that takes a single input signal and routes it to one of several output lines, based on a set of...
• DemurrageA charge payable to the owner of a chartered ship by the charterer for failing to load or discharge cargo...
• DendriteA tree-like crystal structure that forms during the solidification of molten metal, characterized by a...
• DentA localized depression or hollow area on a surface, typically caused by impact or pressure. In manufacturing...
• Denver drillA specific firefighting training exercise designed to simulate the rescue of a downed firefighter from a...
• Deorbit burnA controlled firing of a spacecraft's thrusters to reduce its orbital velocity, initiating a trajectory that...
• DepartTo leave an airport or a specific airspace, initiating a flight or a segment of a flight. This action follows...
• DepartureThe east-west component of a survey line's length, calculated by multiplying the line's horizontal distance...
• DepillarTo remove the support pillars of ore or rock left in place during initial mining to support the roof of a...
• DepletionThe reduction in the quantity of a natural resource, such as minerals, oil, or gas, due to extraction over...
• DepopulateTo intentionally leave certain component positions on a printed circuit board (PCB) unpopulated during...
• DepressantA chemical reagent used in mineral flotation processes to selectively inhibit the flotation of certain...
• DepthThe vertical distance from a reference point, such as the surface of the Earth or a specific datum, downwards...
• DeputyA certified underground mining official responsible for the health and safety of a specific district or...
• DequantizeTo convert a quantized signal back into an analog or higher-resolution digital form. This process involves...
• DerailmentAn incident where one or more wheels of a train leave the rails. This can be caused by track defects...
• Design loadThe total load that a structure or structural element is engineered to safely support, encompassing dead...
• DesiliconisationThe process of removing silicon from molten metal, particularly in steelmaking or the refining of other...
• DesizeTo remove sizing agents from woven fabrics, which are compounds applied to warp yarns to strengthen them for...
• Deskside serverA type of server designed to be placed next to a user's desk, similar in form factor to a desktop computer...
• DestashTo sell or give away surplus materials, tools, or supplies from a personal collection or workshop inventory...
• Destination boardA sign mounted on the exterior of a passenger train, bus, or tram that displays its final stop and sometimes...
• DestrokeTo modify an engine by reducing its piston stroke, the distance the piston travels within the cylinder. This...
• DETAn abbreviation for detachment, a group of maintenance personnel and equipment deployed from a larger...
• DetackifierA chemical additive that reduces the natural stickiness, or tack, of a material's surface, particularly in...
• DetectionThe process of identifying the presence of a signal, event, or physical quantity within a system. This...
• Detector barA mechanical device formerly used at railway switches and crossings to prevent the movement of points while a...
• Detention timeThe period of time a driver or vehicle is delayed at a loading or unloading facility beyond the agreed-upon...
• DetonationA supersonic combustion process characterized by a shock wave propagating through a reactive medium, igniting...
• DetonatorA small, explosive device placed on a railway track to produce a loud report when run over by a train...
• DetrainTo alight or disembark from a train, meaning to exit the railway carriage at a station or other designated...
• DeveloperA chemical agent used in textile dyeing and printing to fix or enhance the color of certain dyes on fabric...
• Development muleA prototype vehicle used by automotive manufacturers to test new components, systems, or technologies in a...
• DeviationThe difference between an observed value or condition and a standard, specified, or expected value. In...
• DeviceAny piece of equipment used in the creation, processing, or output of a digital file in a printing workflow...
• Devil boltA sham or defective bolt, used in shipbuilding to give the appearance of sound fastening and so deceive an...
• Devil seamThe curved seam in a wooden ship's deck planking where the deck meets the side of the ship, near the...
• DezincificationA form of corrosion that occurs in brass alloys where zinc is selectively leached out, leaving behind a...
• DFIDirect Fuel Injection, an engine technology where fuel is injected directly into the combustion chamber of...
• dGPUA discrete graphics processing unit is a dedicated processor designed to handle graphics rendering tasks...
• DIDirect Injection, an engine technology where fuel is injected directly into the combustion chamber of each...
• Dial gaugeA precision measuring instrument used in automotive applications to measure small linear distances or...
• Dial-aroundA method for bypassing a telephone subscriber's preselected long-distance carrier to use an alternative...
• DiamondA historical unit of type size, equivalent to approximately 4.5 points. This small type size was...
• Diamond crossA lace knitting stitch pattern whose stitch count must be a multiple of 17 plus 2, and whose full pattern...
• Diamond crossingA track arrangement where two railway lines intersect at grade, allowing trains to cross each other's path...
• Diamond crossoverTwo crossovers laid one over the other in an X shape between a pair of parallel tracks, so a train can pass...
• Diamond junctionA railway intersection where two tracks cross each other at grade, forming a diamond shape. It allows trains...
• DiaphragmA flexible membrane or thin plate that separates two chambers or acts as a barrier in a mechanical device. It...
• DiascopicRelating to the illumination of a transparent or translucent object by transmitting light through it from...
• DibholeThe lowest part of a mine, the place into which the water from the workings drains and collects. It acts as...
• DICAn abbreviation for Driver Information Center, an electronic display panel in a vehicle's dashboard that...
• DichromaticDescribing a material or optical system that exhibits two distinct colors depending on the viewing angle or...
• Die cuttingA manufacturing process that uses a specialized tool, called a die, to cut, shear, or form materials into...
• Die plateA hardened steel plate containing one or more shaped orifices, used for forming, cutting, or shaping...
• Die-cutTo cut material, such as paper, plastic, metal, or fabric, into a specific shape using a specialized tool...
• DieselA type of internal combustion engine that ignites fuel by compressing air to a high temperature, rather than...
• Diesel engineAn internal combustion engine that ignites fuel by compressing air to a high temperature, rather than using a...
• Diesel exhaust fluidA non-toxic solution of urea and deionized water used in selective catalytic reduction (SCR) systems to...
• Diesel locomotiveA type of railway locomotive that uses a diesel engine as its prime mover. The diesel engine typically drives...
• Diesel multiple unitA self-propelled train consisting of multiple carriages, where each carriage or a subset of carriages has its...
• Diesel particulate filterA device installed in the exhaust system of a diesel engine to trap particulate matter, such as soot and ash...
• Diesel-hydraulicDescribing a power transmission system that uses a diesel engine to drive a hydraulic pump, which in turn...
• DiffAn abbreviation for differential, a mechanical gear assembly that allows the wheels on the same axle to...
• Diff lockA mechanism that mechanically locks the two output shafts of a differential together, forcing them to rotate...
• Difference gateA logic gate that produces a high output if its two inputs are different, and a low output if they are the...
• Differential steeringA method of steering a vehicle by varying the speed of wheels on opposite sides, rather than by turning the...
• DigTo break up, excavate, and remove rock, ore, or overburden using manual or mechanical means. The term...
• Digit trunkAnother name for a bus, a common conductor or set of lines that carries digits, meaning data signals, between...
• Digital decayThe gradual degradation of digital data over time, leading to loss of information or corruption of files...
• Digital electronicsA branch of electronics that deals with electronic circuits and systems that operate on discrete voltage...
• Digital footprintThe trail of data left behind by a user's online activities and digital interactions. This includes...
• Digital meterAn instrument that measures an electrical quantity and displays the value numerically on a liquid crystal...
• Digital predistortionA signal processing technique applied to the input of a power amplifier to compensate for its non-linear...
• Digital pressA printing machine that reproduces digital images directly onto a substrate without the need for printing...
• Digital still cameraAn electronic device that captures still images and stores them digitally rather than on photographic film...
• Digital twinA virtual model of a physical object, process, or system that is continuously updated with real-world data...
• Digital-to-analog converterAn electronic device that transforms a digital signal, typically a binary code, into an analog electrical...
• DihedralThe upward angle of an aircraft's wings relative to the horizontal plane. This design feature enhances...
• DilvingA historical method of washing and separating ore, especially tin ore, using a hand-held sieve in a tub or...
• Dimensional shingleAn asphalt shingle manufactured with multiple layers or varying thicknesses to create a textured...
• DimityA sheer, lightweight cotton fabric woven with fine raised cords or stripes, formed by grouping several warp...
• DIMMA dual in-line memory module is a type of computer memory module containing random-access memory (RAM) chips...
• DingleberryAny residual irregularity left on a product after processing, such as a stray lump or blob of surplus...
• DiodeA semiconductor device that allows electric current to flow in one direction only, blocking it in the reverse...
• DipThe downward angle of the Earth's magnetic field relative to the horizontal plane at any point on the...
• Dip stitchA knitting technique where a stitch is worked into a loop or stitch from a row several rows below the current...
• DIP switchA dual in-line package switch, a small manual electric switch packaged with others in a standard dual in-line...
• DipstickA simple measuring tool for checking the fluid level in a reservoir, such as an engine's oil sump or a...
• DirectTo guide an aircraft along a specific flight path or trajectory, typically by air traffic control...
• Direct flightAn airline service that travels from an origin to a destination without any change of aircraft, although it...
• DirectivityA measure of an antenna's ability to concentrate radiated power in a particular direction, relative to the...
• DirectorA parasitic element in a Yagi-Uda antenna that is shorter than the driven element and placed in front of it...
• DirigibleA steerable, powered lighter-than-air aircraft whose envelope is filled with helium or hydrogen and which...
• DirtThe non-valuable rock, soil, and other material that must be excavated to access a desired ore body or...
• DirtyDescribing an aircraft configuration where high-drag devices, such as landing gear and flaps, are extended...
• DisableTo render a function, device, or software feature inactive without physically removing or uninstalling it...
• DisbudTo remove flower buds from a plant, typically to concentrate the plant's energy into fewer, larger blooms or...
• DisbuddingThe practice of preventing or stopping the growth of horns in young livestock, particularly calves, goats...
• DiscA circular concave blade used in agricultural implements for tilling soil, cutting crop residue, and...
• Disc brakeA braking system that uses calipers to squeeze brake pads against a rotating disc, or rotor, to create...
• Disc harrowAn agricultural implement equipped with multiple concave steel discs arranged in gangs, used for secondary...
• DischargeThe release of a substance, such as a fluid, gas, or solid material, from a container, process, or system...
• DisconnectorA mechanical switching device in an electrical power system that isolates a circuit or equipment from the...
• DiscreteDescribing a system or signal that can only take on a finite or countably infinite number of distinct values...
• Discrete componentAn individual electronic component, such as a resistor, capacitor, transistor, or diode, that performs a...
• DishA shallow pan used in mining to wash gold-bearing gravel, and by extension the gravel panned in it...
• DiskThe circular area swept by the rotating blades of a propeller or helicopter rotor. This area is where the...
• Disk driveA data storage device that reads and writes information to a rotating disk or platter. It can be either a...
• Disk wheelA wheel in which a solid disc of pressed steel or similar material joins the hub to the rim, as opposed to a...
• DisplacementThe volume swept by a piston in a reciprocating engine or pump during a single stroke, or the volume of fluid...
• DisplayMatter set in large or prominent type so that it stands out from the body text, as in headlines, titles and...
• DistillationA process of separating components from a liquid mixture by selective boiling and condensation, used in...
• DistortionAn optical aberration that causes straight lines in an object to appear curved in the image, without...
• DistributableCosts that cannot be charged directly to a single cost account, such as shared site overhead or general...
• DistributeTo spread a thin, even film of ink across the rollers of a printing press's inking system before it is...
• DistributionThe process in letterpress printing of returning individual pieces of metal type to their correct...
• DistributorlessDescribing an ignition system in an internal combustion engine that does not use a mechanical distributor to...
• DistrictA geographical region containing a concentration of mineral deposits, mines, or prospecting claims, unified...
• DITAA Caterpillar engine model suffix meaning direct injection, turbocharged and aftercooled, as in the 3412 DITA...
• DitchTo perform a controlled, emergency landing of an aircraft on water. This procedure is executed when flying...
• DitchfinderUK motor trade slang for a cheap, poor-quality car tyre, named for the idea that its weak grip, especially in...
• DitherThe intentional application of a small, pseudo-random noise signal to a system, typically to linearize its...
• DiveA steep, nose-down descent by an aircraft, performed either intentionally as a maneuver or unintentionally...
• DivebombTo aggressively brake and turn into a corner at high speed, often in a racing scenario. This maneuver aims to...
• DiversionA change in the planned route of a vehicle, vessel, or aircraft from its original schedule or destination...
• DiverterThe switch in an on-load transformer tap changer that carries the load current while the tap selector steps...
• Dive-underA railway engineering structure where one track passes underneath another track or set of tracks. This grade...
• DLLA collection of small programs that can be loaded and executed by larger programs as needed. These libraries...
• DLTDigital linear tape, a magnetic tape storage format that uses a single-reel cartridge of half-inch tape and...
• DMCA Destination Management Company, which is a professional services firm possessing local knowledge and...
• DMEDistance Measuring Equipment, an electronic navigation system that provides an aircraft with a slant range...
• DMSA software platform used by automotive dealerships to manage all aspects of their operations, including...
• DobbyA type of shedding mechanism on a loom that controls the individual warp threads to create intricate...
• DockA structure built along the shore of a body of water, such as a harbor or river, where vessels can moor...
• Dock connectorA specialized electrical connector that provides a physical interface for mating a portable electronic device...
• Docking stationA peripheral device that provides a convenient way to connect a portable computer or other electronic device...
• DOCSISAn international standard, Data Over Cable Service Interface Specification, that defines the communication...
• Doctor bladeA thin, flat strip of metal, plastic, or composite material used to scrape excess liquid, such as ink or...
• DocumentationThe collection of technical documents that describes the design, manufacture, operation, and maintenance of a...
• DODDisplacement on demand is an engine technology that deactivates a portion of the engine's cylinders under...
• DoffTo remove finished products, such as bobbins of yarn or rolls of fabric, from a textile machine. This action...
• DogA double-ended side spike driven through a hole in the flange of a rail to hold it to the track bed on a...
• Dog-beltA type of harness worn around the waist, to which a chain was attached for pulling carts or tubs of coal in...
• DoghairA dense stand of small-diameter trees, often of a single species, that are growing very close together. This...
• DOJAn abbreviation for the Department of Justice, the United States federal executive department responsible for...
• DollA short signal post fixed to a bracket on a main signal post, or standing on a signal gantry, carrying the...
• DomeA convex, hemispherical, or curved shape formed or machined onto the end of a component, such as a piston...
• Dome carA type of railway passenger car featuring a distinctive glass-enclosed upper level, or dome, designed to...
• DongleA small hardware device that plugs into a port on a computer or other electronic device, providing additional...
• Donut spareA temporary spare tire that is smaller and lighter than a full-sized road wheel and tire assembly. This...
• DookAn inclined roadway or tunnel driven downwards from a main level in a coal mine, typically following the dip...
• Door openerA mechanical or electromechanical device that automates the opening and closing of a door. This system...
• DopeA liquid coating applied to fabric aircraft surfaces, such as wings and fuselage, to tauten the fabric, make...
• DopedDescribing a semiconductor material that has had impurities intentionally added to it to alter its electrical...
• Dot matrix printerAn impact printer that produces characters and graphics by striking an ink-soaked ribbon against the paper...
• DotyDescribing timber that exhibits early stages of decay, characterized by discoloration or softening of the...
• DoubleTo sail around a headland or other point of land and continue on the far side of it. The verb is used of...
• Double coverageA roofing application in which each course overlaps the one below so far that every point of the deck is...
• Double croppingThe practice of growing two or more crops on the same piece of land within a single growing season. This...
• Double EnglishA historical type size in typography, equivalent to approximately 28 points. This size was often used for...
• Double great primerA large, dated size of metal type of 36 points, twice the 18 points of great primer from which it takes its...
• Double hoeA hand tool for gardening and agriculture that features two distinct working ends, often a broad blade on one...
• Double knittingA knitting technique that produces a reversible fabric with two layers of stitches, effectively creating two...
• Double letterA single piece of metal type that combines two characters, such as 'ff' or 'fl', to improve spacing and...
• Double lock standing seamA type of metal roof seam where two adjacent panels are joined by folding their upturned edges over twice...
• Double picaA historical type size in typography, equivalent to approximately 24 points. This size was frequently used...
• Double small picaA historical type size used in letterpress printing, equivalent to 22 points. This measurement indicates the...
• Double talkA form of speech interference in telecommunications where two or more parties attempt to transmit...
• Double trackA railway line consisting of two parallel tracks, one for trains traveling in each direction, allowing for...
• Double-actingDescribing a mechanical device, such as a cylinder or pump, where fluid pressure or force acts on both sides...
• Double-declutchA manual transmission shifting technique involving pressing the clutch, shifting to neutral, releasing the...
• Double-pointed needleA knitting needle that has tapered points at both ends, allowing stitches to be worked from either side...
• DoublerAn additional layer of material, typically a metal plate or sheet, welded or riveted onto a structural...
• DoubletAn error in typesetting where a word, phrase, or line of text is accidentally repeated. This mistake occurs...
• DoubleweightDescribing a type of photographic paper with a thicker, more substantial paper base than standard...
• DovetailA strong and aesthetically pleasing woodworking joint characterized by interlocking trapezoidal 'tails' on...
• DovetailedA method of joining two pieces of wood using interlocking trapezoidal pins and tails, forming a strong and...
• DowelA cylindrical pin, usually made of wood, metal, or plastic, used to join two adjacent components or to...
• DownReferring to the direction of travel for a train moving away from a major terminal, a capital city, or the...
• DowncastA mine shaft or other opening to the surface through which fresh air is drawn into the underground workings...
• DownconversionThe process of shifting a signal from a higher frequency to a lower frequency, typically in radio frequency...
• DownleadThe conductor that provides an electrical connection from an elevated component, such as an antenna or...
• DownlinkThe communication link from a satellite or base station to a receiving terminal or mobile device. This is the...
• DownshiftTo select a lower gear in a vehicle's transmission, which increases engine revolutions per minute (RPM) and...
• DownsizingThe practice of reducing an engine's displacement to improve fuel efficiency and lower emissions, while...
• DownsprueThe vertical channel in a sand mold through which molten metal flows from the pouring basin to the runner...
• DozenA group or set of twelve items, used as a traditional unit of count in commerce and industry for packaging...
• DozyDescribing wood that is in an early stage of decay caused by fungal growth, appearing soft, weak, and...
• DPCCHThe dedicated physical control channel of UMTS, which carries the pilot bits used for channel estimation...
• DPCHThe dedicated physical channel in UMTS (Universal Mobile Telecommunications System) cellular networks...
• DPDCHDedicated Physical Data Channel, a channel in UMTS (Universal Mobile Telecommunications System) used for...
• D-pillarThe rearmost roof support post on a vehicle with a long cabin, such as a station wagon, SUV or minivan...
• DPLLDigital Phase-Locked Loop, an electronic circuit that generates an output signal whose phase is related to...
• DPNDouble-Pointed Needles: Knitting needles that are pointed at both ends, used in sets of four or five to knit...
• DPRAMA dual-port random-access memory is a type of RAM that allows simultaneous access from two independent ports...
• DraftThe force exerted by a locomotive to pull a train, overcoming resistance from friction, gravity, and air...
• DraftingThe process of drawing water from a static source, such as a pond, river, or portable tank, into a fire pump...
• Drafting siteA designated location where firefighters can draw water from a static source, such as a pond, lake, or...
• Drag boltA heavy removable bolt that passes through the drawbar of a railway vehicle and holds the coupling together...
• Drag parachuteA parachute deployed from an aircraft to create aerodynamic drag, primarily used to shorten the landing roll...
• Drag pathA temporary, informal route through a harvest area along which felled trees or logs are dragged from the...
• DragboxA substantial, often cast-metal part of a locomotive to which the coupling mechanism is attached, so that the...
• Drag-chainA chain that connects a locomotive to its tender, or links carriages and wagons together, so that the pull of...
• DrainOne of the three terminals of a field-effect transistor (FET), analogous to the collector in a bipolar...
• DramA small, open-topped wagon or tub used in coal mines for transporting coal from the working face to the main...
• DrapeThe way a fabric hangs or falls under its own weight, influenced by its fiber content, weave, and finish. A...
• Draught engineAn engine used in mining for pumping water from the workings and for raising heavy weights, typically a steam...
• DrawTo pull a material through a die or opening to reduce its cross-sectional area or change its shape. This...
• Draw frameA machine in textile manufacturing that blends and straightens slivers of fiber, such as cotton or wool, to...
• DrawbarA rigid coupling device used to connect railway cars, particularly between a locomotive and its tender, or...
• DrawboyThe person, historically a child, who assisted a weaver by manually lifting and lowering specific sets of...
• DrawerA mine worker, historically a child or youth, responsible for hauling tubs or carts of mined material from...
• DrawgearThe complete assembly of components at each end of a railway car that connects it to adjacent cars, absorbing...
• DrawheadThe component of a railway coupler that houses the knuckle and other parts, forming the connection point...
• Drawing frameA machine in textile spinning that combines and attenuates several slivers of fibers into a single, more...
• DrawnworkA form of decorative embroidery or openwork on fabric, created by pulling out, or drawing, selected warp or...
• DrawspringA heavy-duty spring incorporated into a railway car's draft gear assembly, positioned between the coupler and...
• DRCA verification process, known as Design Rule Check, that determines if the physical layout of an integrated...
• DRCPA control protocol defined in IEEE 802.1AX for distributed resilient network interconnect, in which two or...
• DREA Drug Recognition Expert, a law enforcement officer trained to identify individuals impaired by drugs. These...
• DreadnoughtA type of battleship characterized by an 'all big gun' armament scheme and steam turbine propulsion, first...
• DreikanterA ventifact, which is a rock shaped by the abrasive action of wind-blown sand. Its characteristic form...
• DresdenwareA style of porcelain decoration originating from the city of Dresden, Germany, characterized by intricate...
• DressTo finish cloth by sizing it with a dressing of gum, starch, china clay, rice water, or oil, which gives the...
• DRIDirect Reduced Iron: A metallic product created by reducing iron ore in solid state, without melting it. This...
• DriftA horizontal or nearly horizontal underground passage driven into a mine from the surface or from another...
• Drift mineAn underground mine accessed by a horizontal or nearly horizontal passage driven into a hillside or mountain...
• DrifterA powerful, air-powered percussion drill mounted on a column or jumbo for drilling horizontal or...
• DriftwayA horizontal or nearly horizontal underground passage in a mine, driven from the surface or from a shaft...
• DrillableDescribing a material or component that can be penetrated by a drill bit without causing excessive wear to...
• Drip edgeA metal flashing installed along the edges of a roof to direct water away from the fascia and prevent it from...
• DriveTo excavate a horizontal or near-horizontal underground opening in a mine, such as a tunnel, drift, or adit...
• Drive outTo expand the spacing between words or letters in a line of text to fill a specific measure or to justify a...
• Drive stickTo operate a vehicle equipped with a manual transmission, requiring the driver to manually select gears using...
• Drive unitA mechanical assembly that provides the motive power for conveying systems, such as conveyor belts or chain...
• Drive wheelA wheel that receives power from an engine or motor and transmits it to the ground or another surface to...
• Drive-by-wireAn automotive control system that replaces traditional mechanical linkages with electronic sensors...
• DrivelineThe entire system of components that transmits power from the engine and transmission to the drive wheels of...
• Driver-only operationA method of operating a train where a single driver is responsible for all operational duties, including...
• DrivetrainThe system of components in a machine that transmits power from the engine or motor to the point of...
• Driving carA rail vehicle fitted with a driver's cab from which the whole train is controlled, usually an unpowered...
• Driving motorA powered car in a multiple unit that carries traction motors and a driver's cab, so the train can be driven...
• Driving under the influenceOperating a motor vehicle while impaired by alcohol, drugs, or other substances that affect one's ability to...
• Driving van trailerA specialized railway vehicle that combines a driver's cab with a luggage or postal compartment, designed for...
• Driving wheelA wheel on a locomotive or powered railway vehicle that receives power directly from the engine or motor to...
• DRLDaytime Running Lights, forward-facing vehicle lights that automatically illuminate when the engine is...
• DRODigital Readout: An electronic display unit that shows the precise position of a machine tool's axis, such as...
• DroneAn unmanned vessel, either aerial (unmanned aerial vehicle) or marine (unmanned surface vessel or underwater...
• DroopA downward deflection of a control surface or leading edge from its neutral position. It can be deliberate...
• DropA casting defect in which sand breaks away from the cope, the upper half of the mold, and falls into the...
• Drop hammerA type of forging hammer that lifts a heavy ram and releases it to fall under gravity, striking a workpiece...
• Drop kerbA section of pavement where the kerbstone is lowered to meet the level of the road, facilitating easier...
• Drop lightA portable work light used in railway maintenance and inspection, consisting of a light source enclosed in a...
• Drop tankA portable, open-topped, collapsible reservoir used for temporary water storage, primarily in firefighting...
• DropboxA loom attachment, mounted at one or both ends of the shuttle race, that holds a stack of shuttles carrying...
• Drop-inDescribing a replacement component or substance designed to be a direct substitute for an original one...
• DropperA small, downward-projecting vein or stringer of ore that branches off from a larger lode or mineralized...
• Dropping pointThe temperature at which a lubricating grease becomes fluid enough to drip from a container under...
• Drugged drivingOperating a motor vehicle while impaired by the effects of illicit drugs, prescription medications, or...
• Drunk drivingOperating a motor vehicle while under the influence of alcohol to a degree that impairs one's ability to...
• Drunken treesTrees that are leaning at odd angles, often in different directions, rather than growing straight upright...
• DryDescribing a construction method that uses prefabricated materials, such as gypsum board or paneling...
• Dry blowerA piece of mining equipment used to separate gold or other heavy minerals from dry, unconsolidated material...
• Dry offThe practice of ceasing to milk a dairy cow for a period before she is due to calve. This managed...
• Dry sumpAn engine lubrication system that stores engine oil in a separate reservoir, rather than in the oil pan...
• Dry wellAn underground structure designed to collect and slowly disperse stormwater runoff into the surrounding soil...
• Drying timeThe period required for a coating, adhesive, or other wet material to transition from a liquid or semi-liquid...
• DSCDigital Selective Calling, a standard for sending pre-defined digital messages over radio, primarily used in...
• DSLA family of technologies that carries digital data over the copper wires of the local telephone network. In...
• DSPA specialized microprocessor, or Digital Signal Processor (DSP), with an architecture designed for the...
• D-subA common type of electrical connector named for its characteristic D-shaped metal shield. This shape provides...
• DTCA Diagnostic Trouble Code, an alphanumeric code generated by a vehicle's onboard diagnostic (OBD-II) system...
• DTMAn abbreviation for "dye-to-match," referring to the process of custom-matching the color of a textile...
• DtrAn abbreviation used in crochet patterns for double treble crochet, a tall stitch made by wrapping the yarn...
• DualizeTo convert a single-carriageway road into a dual-carriageway road by adding a second carriageway and a...
• DuallyA pickup truck or light-duty commercial vehicle equipped with two wheels on each side of the rear axle...
• Dual-voltageDescribing railway rolling stock, particularly locomotives or multiple units, capable of operating under two...
• DuckbillA type of check valve characterized by its flexible, flattened, and tapered opening that resembles a duck's...
• DuckfootA type of cultivator sweep or shovel characterized by its broad, flat, and often three-pronged shape...
• DucoA brand name for a type of automotive lacquer paint, historically popular for its quick-drying properties and...
• Ductile fractureA mode of material failure characterized by extensive plastic deformation before the final separation of the...
• DuctorA roller in an inking system that transfers ink from the ink fountain to the distribution rollers. This...
• DudleyA colloquial name given by 18th and 19th-century quarrymen to a specific type of trilobite fossil, Calymene...
• Dumpy levelA surveying instrument used to establish or verify points that lie on the same horizontal plane. It consists...
• Dune buggyA recreational motor vehicle with large, wide tires designed for driving on sand dunes, beaches, or desert...
• DuobinaryA method of digital data transmission that encodes binary data into a three-level signal, using a technique...
• DuodecimoA book size or format in which each sheet of paper is folded three times, resulting in twelve leaves or...
• DuplexDescribing a microstructure in metals that consists of two distinct phases, often with different crystal...
• DuplexerAn electronic device that allows a single antenna to be used for both transmitting and receiving signals...
• DuraluminAn early type of age-hardenable aluminum alloy, primarily composed of aluminum with copper as the main...
• Dust jacketA detachable outer cover, usually made of paper, that wraps around the hardcovers of a book. It serves to...
• DusterA machine for cleaning rags, esparto grass, or other raw fibrous materials before they are pulped. It...
• DUTA device under test is any electronic component, circuit, or system that is being evaluated or measured for...
• Dutch cornerA bricklaying detail at a wall corner in which a three-quarter brick is laid as the closure, so that the bond...
• DutchmanA piece of wood inserted into a larger piece to repair a defect, fill a knot hole, or cover a mistake. This...
• Duty cycleThe ratio of the duration of an active period (or pulse width) to the total period of a repetitive waveform...
• DuvetynA twill-weave fabric, typically made from cotton, with a napped surface on one side that creates a soft...
• DVCSA video compression paradigm where the encoder is significantly less complex than the decoder, contrasting...
• DVD driveAn optical disc drive that reads data from and may write data to Digital Versatile Discs. It uses a laser...
• DVTAn abbreviation for Driving Van Trailer, a specialized railway vehicle that combines a driver's cab with a...
• DwangA short piece of timber fitted horizontally between joists or studs to provide bracing and stiffening to a...
• DWDDead woody debris, referring to fallen trees, branches, and other woody material on the forest floor. This...
• DwellA programmed pause or period of inactivity in a machine's operational cycle, where motion or action is...
• Dwell timeThe duration for which a system or component remains in a particular state or position during an operational...
• DWMAn abbreviation for Downed Woody Material, encompassing all dead woody debris on the forest floor, including...
• DWVA system of pipes designed to remove wastewater and sewage from a building and to vent sewer gases to the...
• DyelineA reproduction process using diazo-coated paper that copies line drawings such as engineering plans. The...
• DykeA tabular body of igneous rock that cuts across the layering or fabric of the surrounding rock. These...
• Dynamic brakingA braking system on railway vehicles where the traction motors are used as generators to convert the train's...
• Dynamic headroomThe ability of an audio amplifier to output power levels higher than its continuous or rated power for brief...
• Dynamic ignition timingThe process of adjusting the precise moment a spark plug fires relative to the piston's position while an...
• Dynamic IP addressAn Internet Protocol address that is temporarily assigned to a device by a DHCP (Dynamic Host Configuration...
• DynamicistAn engineer or scientist specializing in dynamics, the branch of mechanics concerned with the motion of...
• DynamoAn electrical generator that produces direct current by rotating a wire armature in a magnetic field. A...
• Dynamometer carA specialized railway vehicle equipped with instruments to measure and record the forces exerted by a...

447 of 7,291 terms in Industrial and trades terminology (MLC-0113). Request the full dataset.