Industrial and trades terminology · MLC-0113

Industrial and trades terms: R (403)

• R2RAn abbreviation for roll-to-roll processing, a manufacturing method where a flexible substrate is fed from a...
• RAAFRoyal Australian Air Force: The aerial warfare branch of the Australian Defence Force. It operates a fleet of...
• Rabbet jointA joint formed by cutting a rectangular groove along the edge or end of a board, into which another board is...
• RACA British motoring organization that provides breakdown assistance, vehicle recovery and other motoring...
• RaceThe channel or track along the front of a loom's reed through which the shuttle passes as it carries the weft...
• Race conditionA situation in an electronic system or software where the output depends on the unpredictable timing or...
• Race rotationThe slow turning of a bearing ring on its shaft or inside its housing, also called ring creep, instead of...
• RacetrackingA phenomenon in composite manufacturing where resin flows preferentially along the edges or gaps of a mold or...
• RackA linear gear with teeth cut along a straight edge, designed to mesh with a rotating pinion gear to convert...
• Rack railwayA railway in which a toothed rack rail laid between the running rails is engaged by a cogwheel on the...
• Rack rateThe official, non-discounted price for a service, such as freight transportation or warehousing, before any...
• RackingThe distortion of a structural frame or panel, such as a wall or roof, from a rectangular shape into a...
• RadA common abbreviation for a radiator, a heat exchanger used to transfer thermal energy from a heating medium...
• Radar cross sectionA measure of an object's ability to reflect radar signals, indicating how detectable it is by radar. It...
• Radial shaft sealA mechanical component designed to prevent the leakage of fluid or the ingress of contaminants along a...
• Radiant heatThe transfer of thermal energy through electromagnetic waves, primarily in the infrared spectrum, without...
• RadiatorA heat exchanger designed to transfer thermal energy from a hot fluid to the surrounding air. It consists of...
• Radiator hoseA flexible conduit, typically made of reinforced rubber or silicone, that connects the engine to the radiator...
• Radio-frequency identificationA technology that employs radio waves to read and capture information stored on a tag attached to an object...
• Radish ripperA farmers' nickname for forage radish, also called tillage radish, a cover crop grown for its thick taproot...
• RadiumA radioactive metallic element, symbol Ra, known for its intense radioactivity and luminescence...
• RAFThe air force of the United Kingdom, formed on 1 April 1918 by merging the Royal Flying Corps and the Royal...
• RafterA structural timber or beam that supports the roof covering of a building, extending from the ridge to the...
• RaggleA groove or channel cut into a masonry or concrete surface, designed to receive and secure the edge of...
• RagiThe grain of an annual plant, Eleusine coracana, also known as finger millet, cultivated as a food crop in...
• RailA conductive bar or strip that provides a common electrical connection point for multiple components or...
• Rail anchorA steel clip or fastener attached to the base of a rail and pressed against the side of a crosstie or...
• Rail brakeA braking system used on railway vehicles that applies friction directly to the running rails to slow or stop...
• Rail grinderA specialized machine used to remove surface defects, corrugations, and irregularities from railway tracks...
• Rail headThe topmost part of a rail's cross-section, which makes direct contact with the wheels of rolling stock. This...
• Rail jointA connection between the ends of two adjacent rails, normally made by bolting a pair of fishplates, one on...
• Rail spikeA large nail-like fastener used to secure a rail to a wooden railway tie or sleeper. It features a pointed...
• Rail terminalA facility where freight or passengers are transferred between trains and other modes of transportation, or...
• Rail trailA multi-use path created from a disused railway line, converted for recreational activities such as walking...
• Rail wagonA piece of railway rolling stock designed for carrying freight or goods. These vehicles are unpowered and are...
• RailcarA wheeled freight vehicle designed to be moved on a railway track as part of a train. These unpowered units...
• RailheadThe furthest point to which a railway line has been constructed and is operational. This location often...
• Railroad spikeA heavy-duty fastener used to secure steel rails to wooden railroad ties, preventing lateral movement and...
• Railroad tieA rectangular support member, typically made of wood, concrete, or steel, laid perpendicular to the railway...
• Railroad trackThe permanent way for trains, consisting of two parallel steel rails fixed at a consistent distance apart...
• RailroadingThe business and practice of operating railways, encompassing all activities from train movement and...
• Railway keyA key that locks and unlocks the doors of railway carriages and compartments, normally permitted only to...
• Railway signalA device that conveys information to train operators regarding the state of the track ahead or the authority...
• Rainbow eraThe early period of Amtrak, which began operating in 1971, when its trains were made up of passenger cars and...
• RaiseA vertical or steeply inclined underground opening excavated from a lower level to a higher level in a mine...
• Raise steamTo heat water in a boiler to generate steam, typically in a steam locomotive or other steam-powered...
• Raising pieceA timber placed flat on top of a brick wall or a framework so that it can carry one or more beams, acting as...
• Raising plateA horizontal timber or beam that sits on top of a wall or foundation, providing a continuous bearing surface...
• RakeA tool consisting of a long handle with a head comprising a row of tines or teeth, used for gathering...
• Raking fireA naval warfare tactic of firing guns along the length of an enemy ship from ahead or astern, so that each...
• RakuA Japanese pottery firing technique that involves removing ceramic ware from the kiln at peak temperature and...
• RamAn adult male sheep, specifically one kept for breeding purposes in livestock farming. Rams are selected for...
• RambleA thin layer of shale or sandstone lying directly on top of a coal seam, in British coalfield usage also...
• RamjetA type of air-breathing jet engine that uses the forward motion of the aircraft to compress incoming air...
• Ramp travel indexA measurement used in off-roading to quantify a vehicle's suspension articulation and its ability to keep all...
• RandomThe direction in which a rake vein runs, meaning the bearing taken by a steeply dipping fissure vein across...
• Random access memoryA type of computer memory that allows data to be read from or written to any memory location in approximately...
• Range anxietyThe concern experienced by drivers of electric vehicles (EVs) that their vehicle has insufficient battery...
• Range extenderA small internal combustion engine included in an electric vehicle (EV) that does not directly power the...
• Range outTo establish a straight line between two points by placing intermediate points along the line using visual...
• RapTo strike a casting pattern embedded in a sand mold with light blows from a mallet or vibrator just before it...
• RapperA mechanical device used in industrial settings, particularly in mining or material handling, to dislodge...
• RasterA rectangular grid of pixels or dots used to display images on electronic screens or for printing. Each pixel...
• RateThe speed at which a vessel travels through water, or the measure of its progress over a given period. It can...
• RatiolessRelating to a type of digital logic circuit, particularly in MOS technology, where the output voltage levels...
• RatiometricDescribing a measurement technique where an output signal is proportional to a ratio of two input signals...
• Rat-tail spliceA method of joining two or more electrical conductors by twisting their bared ends together to form a...
• RattlerA train, especially a freight train, characterized by the loud, clattering sounds produced during motion...
• Rayleigh's resolution limitA criterion defining the minimum angular separation between two point sources of light for them to be...
• RBWAn acronym for Resolution Bandwidth, a parameter in spectrum analyzers that defines the bandwidth of the...
• RCPAn abbreviation for Reinforced Concrete Pipe, a composite material product used for gravity flow and low-head...
• REThe station code for Rewari Junction, a railway junction station in Rewari, Haryana, India. Indian Railways...
• ReactiveRelating to the component of electrical power that oscillates between the source and the load, not performing...
• ReactorAn electrical component designed to introduce inductance into a circuit, consisting of a coil of wire wound...
• ReaderboardAn electronic sign designed to display changeable text-based information, constructed from a grid of lights...
• Real imageAn image formed by the actual convergence of light rays at a specific point in space. This type of image can...
• ReamageThe total number of reams of paper required for a specific print job, including allowances for waste and...
• Reaper-binderAn agricultural machine that cuts grain crops and then ties them into bundles, or sheaves, for easier...
• Rear-endThe final drive assembly in a vehicle that transmits power from the driveshaft to the wheels, consisting of...
• ReballingThe process of removing and replacing the solder balls on a ball grid array (BGA) package, typically...
• RebarredDescribing concrete that has been reinforced with steel reinforcing bars, commonly known as rebar, to enhance...
• RebeamTo transfer warp yarn from one beam to another by winding it off the first and onto the second. Rebeaming is...
• RebirthingThe illegal practice of disguising a stolen vehicle by altering its identification numbers, such as the...
• ReboreThe process of machining an engine cylinder to a larger diameter to remove wear, damage, or to accommodate...
• ReceiveTo acquire or detect a signal, data, or energy transmitted from a source. In electronics, this involves a...
• RECEOAn acronym for Rescue, Exposures, Confinement, Extinguishment, and Overhaul, outlining the sequential...
• ReceptacleAn electrical outlet or socket designed to receive a plug, providing a connection point for electrical...
• ReceptionThe act of receiving a signal, such as radio waves, electrical impulses, or data, by a device or system. This...
• ReconductorTo replace the conductors on an existing overhead transmission or distribution line with new ones, to raise...
• RecoverTo install a new roof covering directly over an existing one without removing the original material. This...
• RecoveryThe proportion of a valuable mineral or metal extracted from its ore during a mining and processing...
• RecrystallizationThe process where deformed grains in a metal are replaced by a new set of strain-free grains during...
• RectifyTo convert alternating current (AC) into direct current (DC) using electronic components. This process is...
• Red cardA certification issued to wildland firefighters in the United States, indicating that an individual has met...
• Red flagA warning signal used in railway operations to indicate a hazard or a requirement for trains to stop. This...
• Red hydrogenHydrogen made with nuclear energy, either by electrolysis powered by a reactor or by splitting water with...
• Red light cameraAn automated traffic enforcement camera system that detects and records vehicles that proceed through a...
• Red liquorA mordant solution of aluminum acetate used historically in textile dyeing to affix natural dyes to...
• Red rotThe dezincification of brass, in which zinc is selectively leached out and a weak, porous, mostly copper...
• RedcapA railway station porter whose job is to assist passengers with their luggage and other needs, historically...
• RedlineThe maximum safe operating speed, measured in revolutions per minute (RPM), for an internal combustion...
• RedsearA condition in steel where it becomes brittle and cracks when worked at red heat. This phenomenon is caused...
• ReduceTo remove oxygen or other non-metallic elements from a metal compound, such as an ore, to produce the...
• ReducerA pipe fitting that connects two pipes of different diameters, allowing for a change in flow area within a...
• ReductionThe process of decreasing the cross-sectional area of a workpiece through a forming operation like rolling...
• Reduction driveA mechanical system that decreases the rotational speed of an output shaft relative to its input shaft, while...
• ReductiveDescribing a chemical process or environment that causes reduction, the addition of electrons to a substance...
• RedworkA traditional embroidery technique that uses only red thread to create intricate designs on a plain...
• ReedA comb-like device in a loom, consisting of a series of vertical wires or dents set into a frame, through...
• ReedyDescribing a metallic fracture surface that exhibits a fibrous or splintered appearance, resembling reeds...
• ReeferA type of railway car specifically designed for transporting perishable goods that require temperature...
• ReelA rotating device used in agriculture to wind or unwind flexible materials such as irrigation hoses, electric...
• ReentrantDescribing a design feature that points inward or reverses direction, such as a corner or angle directed into...
• Re-entryThe return of a spacecraft or other object into Earth's atmosphere from space, during which drag and...
• RefarmingThe reallocation of radio frequency spectrum from one wireless technology or service to another. This process...
• ReformateA high-octane liquid product resulting from the catalytic reforming of low-octane naphtha in a petroleum...
• ReformerA processing unit in a petroleum refinery or chemical plant that converts low-octane hydrocarbons into...
• RefractTo cause a light ray or other wave to change direction as it passes from one medium into another with a...
• RefractionThe change of direction of a wave, such as light or sound, as it crosses from one medium into another where...
• Refractory metalA class of metals that are highly resistant to heat and wear, possessing exceptionally high melting points...
• RefreshableDescribing a display, memory or data view whose contents can be updated or redrawn on demand. A refreshable...
• RegainThe percentage of moisture present in a textile material after it has been dried to a constant weight and...
• Regal geraniumA type of geranium (Pelargonium x domesticum) known for its large, showy flowers in vibrant colors, which...
• RegenA process in diesel vehicles equipped with a diesel particulate filter (DPF) to burn off accumulated soot...
• RegeneratedDescribing a material that has been dissolved or reprocessed and then re-formed into a new solid with...
• Regenerative brakingA braking method where the kinetic energy of a moving vehicle is converted into electrical energy and stored...
• Regenerative furnaceA type of industrial furnace that uses exhaust gases to preheat incoming combustion air or fuel, thereby...
• RegisterThe precise alignment of separate colors or impressions on a single sheet of paper during the printing...
• RegletA thin, flat strip of wood or metal used in letterpress printing to create spacing between lines of type or...
• RegrateTo remove the surface of old stonework or masonry by cutting or scraping in order to expose a fresh...
• RegrowingThe process by which a plant or plant part regenerates new growth after being harvested or cut back. This can...
• RegulatorA control lever in a steam locomotive that governs the admission of steam from the boiler to the cylinders...
• RehabA designated area and process for emergency responders to rest, rehydrate, and receive medical monitoring...
• RehabilitateTo repair, alter, or add to an existing building or structure to return it to a state of utility through...
• ReiterationThe action of printing on the second side of a sheet after the first side has been printed, a process also...
• RejigTo reprocess tailings or low-grade ore through a jig concentrator to recover additional valuable minerals...
• RejointTo repair the external mortar joints in brickwork or masonry that have weathered or decayed over time. The...
• RelayAn electrically operated switch that uses an electromagnet to open or close contacts, thereby controlling a...
• Relay roomA secure, climate-controlled space that houses electrical relays, terminal blocks, and associated control...
• ReleaseTo disengage the brakes on a railway car or train so that the wheels turn freely again. With the automatic...
• Release timeThe interval between the moment a driver releases the brake control and the point at which braking force...
• RelishA projection or shoulder left at the side of a tenon, or around the mortise it enters, in a framed wooden...
• ReluctorA component in an ignition system or sensor that creates a change in a magnetic field. This change induces an...
• RemblaiWaste rock or other fill material used to backfill voids in an underground mine, particularly in cut-and-fill...
• RemineralizationThe process of restoring essential minerals to depleted agricultural soils, often through the application of...
• Remote accessThe ability to connect to and control a computer, network, or industrial control system from a geographically...
• Remote keyless entryA system that allows a user to lock or unlock a vehicle's doors and often perform other functions, such as...
• RenderTo apply a coat of cement, lime, or polymer-based mixture to the exterior surface of a wall, typically...
• RendezvousThe process of bringing two or more spacecraft or aircraft together in close proximity, typically for...
• Rent's ruleAn empirical rule in integrated circuit design that describes the relationship between the number of external...
• ReoA slang abbreviation for reinforcing bar, the steel rods embedded in concrete to provide tensile strength...
• ReoperateTo perform a manufacturing or assembly process again on a product that has already undergone the same...
• RepA type of fabric characterized by prominent transverse ribs or cords, created by using a coarser weft yarn...
• RepayTo coat a vessel's seams or bottom again with pitch, tar, or a similar compound after the earlier coat has...
• RepeaterAn electronic device that receives a signal, amplifies it, and retransmits it to extend the range of a...
• ReperforatorA device that receives telegraphic or teletypewriter signals and converts them into perforations on a paper...
• Replacing switchA pair of iron plates that fit over the rails to form a bridge, used to put the wheels of derailed railway...
• RepointTo remove deteriorated mortar from the joints of a masonry wall and replace it with new mortar. This process...
• ReportA formal document providing a detailed account of a vessel's condition, operations, or a specific event...
• Reporting markA two-to-four letter code, often followed by a number, assigned to railway rolling stock by regulatory bodies...
• RepriseA return of a moulding at an internal angle in masonry, where a moulding that runs along one wall face turns...
• ReproThe process of creating a high-quality duplicate of an original image or document for use in commercial...
• ReseatTo remove and then reinsert a component, such as a circuit board, cable, or integrated circuit, into its...
• ResectionA method of fixing the position of an instrument station by observing angles, distances or bearings from the...
• ReserveA technique in ceramic decoration where a portion of the surface is protected from a glaze or slip...
• Reset buttonA physical or virtual control that initiates a restart or reinitialization of an electronic device or system...
• Resettable fuseA polymeric positive temperature coefficient (PPTC) device that protects an electrical circuit from...
• Residual-current deviceAn electrical safety device that quickly disconnects a circuit when it detects an imbalance between the live...
• Resistance distanceThe perpendicular distance from the pivot point of a lever to the line of action of the resistance force...
• ResistiveRelating to a type of touchscreen technology that detects input from pressure applied to its surface. A...
• ResistivityA fundamental electrical property of a material that quantifies how strongly it resists the flow of electric...
• ResistorAn electrical component that introduces a specific amount of electrical resistance into a circuit to impede...
• ResmeltTo melt a metal or alloy again after its initial solidification, typically for further refining...
• ResolvanceA measure of the ability of an optical instrument, such as a spectrometer or interferometer, to separate...
• ResolveTo distinguish between two closely spaced objects or details in an image or optical system. The ability to...
• ResonanceA phenomenon in electrical circuits where the impedance of a circuit is purely resistive, occurring when the...
• ResonantDescribing a system or circuit that exhibits a large amplitude response when driven at or near a specific...
• Response timeThe duration between the initiation of an event or input and the completion of the system's reaction or...
• ResponsorThe receiver section of an interrogating station in secondary radar or Identification Friend or Foe systems...
• RespotTo perform the final spot welds on a manufactured item, adding the remaining welds to an assembly that was...
• RestressableDescribing a post-tensioning system where the tendons can be re-tensioned or adjusted after the initial...
• RestripeTo repaint the lane markings, parking space lines, or other directional indicators on a paved surface. This...
• RestumpTo replace the supporting stumps or piers under a building, a process also known as reblocking. This work is...
• Retaining valveA type of check valve designed to maintain a minimum pressure in a system or prevent complete drainage. It...
• RetardationThe delay and smearing of an electrical signal travelling along a conductor, first studied on long...
• Retarded timeThe time at which an electromagnetic event occurred at a source, as observed at a later time at a distant...
• RetarderA device used in heavy vehicles, such as trucks and buses, to supplement the primary braking system by...
• ReticulatedDescribing masonry in which diamond-shaped or square-faced stones or blocks are laid with their corners...
• RetroscopicDescribing a spectacle lens, or its mounting, that is tilted in the direction opposite to a pantoscopic tilt...
• ReturnThe airway or passage through which used air, or return air, flows out of the mine workings after ventilating...
• Return currentThe flow of electrical charge that travels from a load back to the power source, completing an electrical...
• Return flowThe movement of water or other liquids back to a source or collection point after being used in an...
• Return keyA control key on a keyboard that typically signals the end of a line of text or a command input. In many...
• Return pathThe conductive route that an electrical current takes to flow from the load back to its source, completing...
• Return springA mechanical spring designed to restore a component to its original position after an external force has been...
• Return ticketA single ticket that allows for travel from an origin to a destination and back to the origin, typically at a...
• REVA Range-Extended Vehicle, which is a type of plug-in hybrid electric vehicle that uses an internal combustion...
• Rev st stAn abbreviation for "reverse stockinette stitch," a basic knitting pattern that creates a fabric with a...
• ReverberateTo heat a charge by throwing heat down onto it from the low arched roof and walls of a furnace, while the...
• ReverseTo change the direction of travel of a train or locomotive, typically by adjusting the valve gear in a steam...
• Reverse gearA specific gear ratio within a transmission that allows a vehicle or machine to move backward. It typically...
• Reverse intaglioA design cut or impressed into the back of a transparent or translucent item, such as glass or crystal, so...
• Reverse linkThe communication path from a mobile station or user equipment back to the base station or network in a...
• Reverse outA printing technique where text or an image appears in the color of the paper or substrate, surrounded by a...
• ReviseA subsequent proof of a printing job that incorporates corrections or alterations requested by the client...
• ReworkThe process of correcting defects or non-conformities in a manufactured product to bring it up to acceptable...
• RFCThe Royal Flying Corps, the air arm of the British Army from its creation in 1912 until 1 April 1918, when it...
• RFDReady for Dyeing, a textile finishing stage where fabric has undergone all necessary preparatory processes...
• RFFEThe circuitry in a wireless device that transmits and receives radio-frequency signals, positioned between...
• RFIDA wireless communication method that employs radio waves to read and capture information stored on a tag...
• RHRelative humidity: The ratio of the partial pressure of water vapor in an air-gas mixture to the saturation...
• RHDAn abbreviation for Right-Hand Drive, referring to vehicles where the steering wheel and driver's controls...
• RheostatA two-terminal variable resistor used to control the current in a circuit. By adjusting its resistance, it...
• RibA raised, elongated structural feature designed to add strength and stiffness to a part without significantly...
• RibbandA long, narrow strip of material, typically wood or metal, used in shipbuilding or construction to...
• RibbedDescribing a coal seam that contains thin layers of slate or similar rock interbedded with the coal. Such...
• RibbonA narrow, continuous plate or batten used in shipbuilding to define the sheer line and other hull curves...
• RICEA Reciprocating Internal Combustion Engine, a heat engine that uses the explosive combustion of fuel to push...
• RidTo clear away fallen stone, loose rubble, or other debris from a working so that the place can be used again...
• RideA fault in hand composition, now historical, in which leads or similar spacing material overlap one another...
• RideableDescribing a small, personal transportation device designed to carry a single person, such as an electric...
• Ridge beamA horizontal structural member located at the apex of a roof, supporting the upper ends of the rafters. It...
• Ridge courseThe final row of shingles or tiles installed along the peak of a roof, covering the intersection of two...
• Ridge tileA specially shaped roofing tile designed to cover and seal the ridge line of a pitched roof. These tiles...
• Ridge ventA continuous ventilation opening installed along the peak of a sloped roof, allowing warm, moist air to...
• RiffleA groove or cleat placed across the bottom of a sluice box or concentrating table to trap heavy minerals...
• RigThe integrated set of machinery and structures used for drilling or servicing wells, such as for oil, gas, or...
• RigareeA decorative glass trail applied to the surface of a glass object, characterized by its crimped or ruffled...
• Right sideThe finished face of a textile, intended for display on the exterior of a garment or other finished product...
• Right-handerA vehicle with its steering wheel and main driver controls located on the right-hand side of the cabin. This...
• RigidDescribing an aircraft component or structure designed to maintain its shape and resist deformation under...
• RIMMA Rambus in-line memory module, the card format that carries RDRAM chips for the Rambus memory channel in PCs...
• Rind graftingA method of grafting where a scion, a detached shoot or bud, is inserted between the bark and wood of a...
• Ring cadenceThe specific pattern of ringing and silence that a telephone produces to indicate an incoming call. This...
• Ring modulationA type of amplitude modulation where two input signals are multiplied together, producing an output signal...
• Ring offTo terminate a telephone call by hanging up the receiver, which signals the central office or switching...
• Ring outA test in which each conductor of a cable or circuit is checked for continuity, used to identify unmarked...
• Ring spinnerA machine used in textile manufacturing to produce yarn by twisting and drafting fibers simultaneously. It...
• Ring timeThe duration for which a telephone rings before an incoming call is either answered, diverted to voicemail...
• RingbackThe audible tone or sound that a caller hears, indicating that the telephone they are calling is ringing at...
• RingdownA signaling method in telephony where a continuous or pulsed alternating current (AC) signal is sent over a...
• Ringer equivalence numberA measurement representing the electrical load a telephone device imposes on the ringing circuit of a...
• RingheadA circular cutterhead for wood planing machines, with several knives arranged around a ring. Ringhead planers...
• RipTo cut a piece of wood along the direction of its grain, typically using a table saw or a circular saw. This...
• RipeDescribing a fruit or vegetable that has reached its full maturity and is ready for consumption. This stage...
• RipperA heavy-duty attachment for construction equipment, such as bulldozers or excavators, designed to break up...
• RippingThe process of cutting a piece of wood along the direction of its grain, typically to reduce its width or to...
• RippleA slight, undulating surface imperfection or pattern on a manufactured product, often resulting from an...
• RipsawA type of saw specifically designed for cutting wood along the grain, or ripping. Its teeth are typically...
• RiseOf a locked form, the ability to be lifted from the imposing stone as one piece without any type dropping...
• Rise timeThe duration required for a signal to transition from a specified low amplitude level to a specified high...
• RiveTo split wood along its grain using a wedge or froe, rather than sawing it. This method produces pieces with...
• RiveterA worker who joins parts with rivets, or the tool or machine that sets them by hammering, squeezing or...
• RJAn abbreviation for Registered Jack, a standardized telecommunication network interface for connecting voice...
• RLVA Reusable Launch Vehicle, designed to be launched into space and then returned to Earth for subsequent...
• RNAn abbreviation for the Royal Navy, the principal naval warfare force of the United Kingdom. It is...
• RoachA curve cut into the leech of a sail, extending beyond a straight line drawn from the head to the clew. This...
• RoadThe main railway line between terminals, distinct from yards, sidings, or branch lines where trains are...
• Road mapA strategic plan that visually communicates the intended direction and timeline for the evolution of a...
• Road rageAggressive or angry behavior exhibited by a driver of an automobile, often in response to perceived offenses...
• Road slugA type of locomotive unit that lacks a prime mover and generator, instead drawing its power from a connected...
• RoadholdingThe capability of a vehicle's suspension and tires to maintain firm contact with the road surface...
• RoadkillAn animal that has been struck and killed by a motor vehicle on a road or highway. This unfortunate...
• Road-rail vehicleA specialized vehicle equipped with both road wheels and retractable railway wheels, allowing it to operate...
• Road-railerA semi-trailer or freight container equipped with both conventional road wheels and a retractable set of...
• RoadsterAn open-top car with two seats and a sporty character, emphasizing driving enjoyment. Historically, roadsters...
• RoadworthyDescribing a vehicle that is in a safe operating condition and meets all legal requirements for use on public...
• RoamTo use a mobile communication device outside of its home network's service area while maintaining...
• RoamingThe ability of a mobile subscriber to automatically access communication services, such as voice calls, text...
• RoastTo heat an ore or concentrate in the presence of air, below its melting point, to effect a chemical change...
• RobotA robotic total station that can be controlled remotely by a single operator carrying the prism pole. The...
• Rock glassA naturally occurring volcanic glass formed as an extrusive igneous rock, created when felsic lava from a...
• Rocker armA pivoting lever in an internal combustion engine that transmits the upward motion of a pushrod or the...
• Rocker switchA type of electrical switch that pivots on a central axis, allowing one end to be pressed down while the...
• RockpickerA worker, machine, or machine part that takes waste rock out of ore during ore dressing, for example by...
• RockpickingThe work of cleaning waste rock out of the ore during ore dressing, done by hand at a picking table or belt...
• RodA tool for clearing blocked drains, made of short segments, usually about a metre long, that screw or clip...
• RodbusterAn ironworker specializing in the placement and securing of steel reinforcing bars, known as rebar, and...
• RoddingThe process of clearing blockages or obstructions from pipes, conduits, or tubes using a flexible rod or...
• RodeThe line or chain connecting an anchor to a vessel. It transmits the holding power of the anchor to the boat...
• Roger thatA phrase used in radio communication to confirm that a message has been received and understood. It serves as...
• RogueAn individual plant that exhibits characteristics different from the desired standard for a particular crop...
• ROIPRadio over Internet Protocol, a technology that allows two-way radio communication to be transmitted over an...
• Roll cageA tubular framework installed inside the cabin of a vehicle to protect occupants in the event of a rollover...
• Roll hoopA structural bar or set of bars positioned behind the occupants of an open-top vehicle, designed to provide...
• Roll offA gradual decrease in the gain or output of an electronic circuit or filter as the frequency moves away from...
• Roll rateThe angular rate at which an aircraft rotates about its longitudinal axis in response to full lateral control...
• RollbackA type of tow truck equipped with a flatbed that can be hydraulically tilted and slid backward to load a...
• RollbockA specialized bogie or truck used on railways to transport a railcar of one track gauge over tracks of a...
• Roller blindA window covering consisting of a single piece of fabric that rolls up or down around a cylindrical tube to...
• Roller machineA piece of industrial equipment that uses rotating cylindrical rollers to flatten, bend, or shape metal...
• RollermanA skilled operator in a steel mill or metalworking facility responsible for controlling the rolling mill...
• RolleyA small, wheeled cart or wagon used in underground mining for transporting materials. These vehicles...
• Rolling blackoutA deliberate, temporary interruption of electric power to different areas on a rotating basis. This measure...
• Rolling brownoutA temporary, intentional reduction in voltage in an electrical power supply system by the utility provider...
• Rolling stopThe act of slowing down but not coming to a complete halt at a stop sign or red light before proceeding. This...
• RolloverA fire phenomenon where unburned gases and smoke at the ceiling level ignite and rapidly spread across the...
• Rollover cableA cable with RJ-45 connectors whose wiring is reversed end to end, used to link a computer's serial port to...
• Roll-to-rollA manufacturing process where a flexible substrate, such as plastic film or metal foil, is continuously...
• RollyA small, four-wheeled wagon or cart used in underground mines for transporting coal, ore, or waste rock. This...
• ROMA type of non-volatile semiconductor memory, Read-Only Memory, from which data can be read but not easily...
• RomanA typeface style characterized by upright letters with serifs, often exhibiting a contrast between thick and...
• RONAn abbreviation for Research Octane Number, a standard measure of a gasoline's resistance to engine knocking...
• RonnagramA unit of mass equal to 10^27 grams, which is one thousand yottagrams or 10^24 kilograms. That is about one...
• RonnametreA unit of length equal to 10^27 metres, which is one octillion metres. It is denoted by the prefix ronna...
• RonnasecondA unit of time in the International System of Units (SI) equal to 10^27 seconds. This immense duration is...
• RontogramA unit of mass equal to one octillionth (10^-27) of a gram, formed by attaching the SI prefix ronto to the...
• RontosecondA unit of time equal to one octillionth (10^-27) of a second, formed by attaching the SI prefix ronto to the...
• RoofThe overhead rock surface or strata forming the upper boundary of an underground mine excavation, such as a...
• Roof assemblyThe complete system of components that forms the top covering of a building, providing protection from...
• Roof curbA raised frame or platform installed on a flat or low-slope roof to provide a level and waterproof mounting...
• RoofboltA steel rod or bar installed into the roof of an underground mine working to reinforce the rock mass and...
• RoofbolterA specialized piece of mining equipment used to install roof bolts into the rock strata above a mine opening...
• Roof-plateA horizontal timber or steel member that forms part of the roof structure, typically supporting the lower...
• RoofstoneA layer of rock or other material forming the immediate roof of a mine working, particularly in coal or other...
• RoomAn excavated chamber or open space created within a mine, typically as part of a room and pillar mining...
• Room and pillarA method of underground mining where mineral deposits are extracted in a series of 'rooms' or open...
• RoometteA compact, private sleeping compartment on a passenger train, typically offering a bed, a toilet, and a...
• RootThe part of an aircraft wing or rotor blade that attaches to the fuselage or hub. This section experiences...
• RootstockThe lower part of a grafted plant, consisting of the root system and sometimes a portion of the stem, onto...
• RopeA decorative element in ceramics resembling a twisted cord, created by extruding or hand-rolling two or more...
• Rosa mundiA cultivar of the species Rosa gallica, an ancient variety of rose known for its distinctive striped petals...
• RoseheadA type of hand-forged nail characterized by a faceted, petal-like head formed by four or more hammer blows...
• Rosin paperA heavy-duty, resin-impregnated paper used as an underlayment or protective barrier in construction. It is...
• Rotary converterAn electromechanical device that transforms electrical power from one form to another, specifically...
• Rotary switchA type of electrical switch operated by rotating a shaft, which makes or breaks contact with a series of...
• Rotary tableA circular work-holding device that rotates a workpiece around a single vertical or horizontal axis on a...
• Rotation timeThe period of years required to grow a stand of timber from regeneration to a specified size or condition for...
• Rother nailA nail with a very full head, used in shipbuilding to fasten the rudder irons, the metal fittings that hang a...
• RotoliningA process that applies a polymer lining to the interior surface of complex metal parts, such as tanks or...
• RotorThe rotating component of an electrical machine, such as a motor or generator, or a mechanical device like a...
• Rot-steepA process in textile manufacturing where flax or hemp fibers are immersed in water to encourage microbial...
• RoughageA type of livestock feed, such as hay, silage, or pasture grass, that is high in dietary fiber and low in...
• RouleauA small, decorative roll or bundle, often referring to a rolled-up strip of fabric or paper used as an...
• Round danceA honeybee dance in which a forager runs in tight circles on the comb, alternating clockwise and...
• Round robinA method of inter-laboratory or inter-machine testing where identical samples of a textile material are...
• Round tripA journey or travel itinerary that begins at one location, proceeds to a destination, and then returns to the...
• RoundelA circular insignia painted on the fuselage and wings of military aircraft to identify their nationality...
• RoundhouseA circular or semi-circular building used for housing and servicing locomotives, particularly steam...
• RoundnessA geometric tolerance that defines how closely a surface of revolution, such as a cylinder or sphere...
• Round-trip timeThe duration required for a signal or data packet to travel from a source to a destination and for an...
• RoundupThe process of gathering livestock, such as cattle or sheep, from a large area into a central location for...
• RouteA specific path or sequence of railway tracks and associated infrastructure that a train follows from its...
• RouterA network device that forwards data packets between different computer networks, directing traffic based on...
• RoverA roving frame, the machine that draws sliver down to a thinner strand, gives it a slight twist, and winds it...
• RowTo propel a boat through water using oars. The oars are typically pivoted in oarlocks on the gunwales, and...
• Row cropAny agricultural crop planted in distinct, spaced rows wide enough to allow for cultivation by machinery...
• Row upTo arrange harvested crops, such as hay or grain, into long, continuous rows or windrows in the field. This...
• RowinessA fault in fabric in which visible rows or streaks show across the cloth, usually from variations in yarn or...
• RowyDescribing a fabric that has an undesirable appearance of visible rows or streaks, usually from variations in...
• RoyalA standard paper size, larger than demy but smaller than imperial, historically used for printing books and...
• Rozière balloonA type of hybrid balloon that combines features of both hot-air balloons and gas balloons. It contains...
• RP-1A highly refined kerosene-based rocket propellant, used as fuel in many liquid-propellant rocket engines. It...
• RPMAn abbreviation for Revolutions Per Minute, a unit measuring the rotational speed of a component. In rail...
• RRAn abbreviation for Rolls-Royce, a prominent manufacturer of aircraft engines for civil and military...
• RSAn abbreviation that can refer to 'Right Side' in manufacturing, indicating a specific orientation for...
• RS-232A standard for serial communication interfaces connecting data terminal equipment (DTE) to data...
• RSJA rolled steel joist, a type of structural steel beam with an I-shaped cross-section, commonly referred to as...
• RS-MMCA smaller variant of the MultiMediaCard (MMC) memory card format, designed for use in compact portable...
• R/TThe Road/Track performance designation used by Dodge on its vehicles, indicating a package that includes...
• RTAn abbreviation that commonly stands for 'Radiographic Testing,' a non-destructive examination method used to...
• RTIA ramp travel index, a measurement used to quantify a vehicle's suspension articulation and off-road...
• RTOA rejected takeoff, an aborted attempt to depart from a runway after the aircraft has begun its takeoff roll...
• RTTRound-Trip Time, the duration it takes for a signal or data packet to travel from a sender to a receiver and...
• RubberAn elastic polymer material used extensively in electrical engineering for insulation and sealing...
• RubyA traditional British type size of 5.5 points, between pearl at 5 points and nonpareil at 6 points, used for...
• Rug hookingA craft in which loops of yarn or fabric strips are pulled through a woven fabric base, such as burlap or...
• RuleA continuous printed line, either straight or ornamental, used to divide or decorate a page layout. Rules...
• RunA continuous period of operation for a piece of mining equipment or a section of a mine, such as a conveyor...
• Run a red lightTo proceed through an intersection after the traffic signal has turned red, indicating that vehicles facing...
• Run aroundTo move a locomotive from one end of a train to the other, typically to change the direction of travel or to...
• Run inTo set text continuously without paragraph breaks, often used for short items in a list or index to save...
• Run of houseA hotel booking where the guest is assigned any available room upon check-in, rather than a specific room...
• Run onA printing instruction indicating that a new section of text should follow immediately after the preceding...
• Run on fumesDriving a vehicle with the fuel gauge at or below empty, so little fuel remains that the engine could stall...
• Run upTo increase an aircraft engine's power to a high setting while the aircraft is stationary on the ground...
• Run upon sortsA situation in letterpress printing where a compositor exhausts the supply of a particular character (sort)...
• RunaroundThe practice of setting text to flow around an image, graphic, or other element on a page, creating an...
• Runaway dieselAn uncontrolled overspeed condition in a diesel engine where the engine draws its fuel from an external...
• Runaway trainA train or portion of a train that is moving uncontrolled, typically due to a loss of braking power or an...
• Runaway truck rampAn emergency safety feature constructed on steep downhill grades of highways to provide a safe stopping area...
• Run-flatDescribing a type of tire designed with reinforced sidewalls or an internal support system that allows it to...
• RungheadThe upper end of a floor timber, the transverse frame member that lies across the keel in a ship's bottom. It...
• RunnerA line or wire rope used in rigging to provide support or to hoist and lower objects. It typically runs...
• Running boardA narrow platform extending along the side of a locomotive or railway car, providing a foothold for crew...
• Running gearThe wheel-carrying assemblies of a vehicle or railcar, made up of the axles, wheels, hubs, bearings, springs...
• Running lineA railway track designated for the movement of trains between stations or other operational points, as...
• Running powersThe contractual right granted to one railway operating company to operate its trains over the tracks owned by...
• Running railOne of the two main rails on a railway track that directly supports and guides the wheels of a train. These...
• Running sandA condition where saturated, fine-grained sand loses its bearing capacity and behaves like a liquid under...
• Running shedA building or facility where locomotives are housed, serviced, and prepared for their next duty between...
• Running stitchA basic hand-sewing technique that creates a simple, straight line of stitches by repeatedly passing the...
• RunoutThe deviation of a rotating surface or axis from its ideal concentric or straight path. It measures the total...
• RunoverThe portion of a line of text that extends to the next line, or the portion of a paragraph that continues...
• RunroundA secondary track or loop of railway line that allows a locomotive to detach from its train, move past it...
• RunwayA rectangular area on an airfield prepared for the takeoff and landing of aircraft. Runways are typically...
• Russia calfA type of high-quality leather, historically made from calfskin, known for its distinctive aroma, durability...
• Russia drabA coarse, unbleached hemp fabric whose name points to Russia, formerly used for cheap, hard-wearing clothing...
• Russia ironA smooth, glossy black sheet iron made in Russia in the 19th and early 20th centuries, with an oxide surface...
• Russia linenA coarse cloth woven from hemp that Russian mills produced in large quantity in the 18th century and sold...
• Russian blouseA garment characterized by a high, round neckline and a side or front opening that fastens with buttons or...
• RVRecreational Vehicle: A motor vehicle or trailer equipped with living quarters and amenities designed for...
• RWDRear-Wheel Drive: A drivetrain configuration in an automobile where engine power is transmitted exclusively...

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