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Glossary · Nouns · R

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TermTypeDefinitionClassificationsUpdated
Reed InstrumentnounMWEa musical instrument that sounds by means of a vibrating reedverifiedMay 18, 2026
Reed MacenounMWEtall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of downverifiedMay 18, 2026
Reed Meadow GrassnounMWEa pasture grass of moist places throughout North AmericaverifiedMay 18, 2026
Reed OrgannounMWEa free-reed instrument in which air is forced through the reeds by bellowsverifiedMay 18, 2026
Reed PipenounMWEorgan pipe with a vibrating reedverifiedMay 18, 2026
Reed RhapisnounMWEChinese lady palm with more slender stems and finer sheath fibers than Rhapis excelsaverifiedMay 18, 2026
Reed SectionnounMWEthe section of a band or orchestra that plays reed instrumentsverifiedMay 18, 2026
Reed StopnounMWEan organ stop with the tone of a reed instrumentverifiedMay 18, 2026
Reedbirdnounsmall European warbler that breeds among reeds and wedges and winters in AfricaverifiedMay 18, 2026
Reef KnotnounMWEa square knot used in a reef lineverifiedMay 18, 2026
Reef SquirrelfishnounMWEon reefs from Bermuda and Florida to northern South AmericaverifiedMay 18, 2026
Reef Whitetip SharknounMWEsmooth dogfish of Pacific and Indian Oceans and Red Sea having white-tipped dorsal and caudal finsverifiedMay 18, 2026
Reefernounmarijuana leaves rolled into a cigarette for smokingverifiedMay 18, 2026
Reelectionnounelection againverifiedMay 18, 2026
Reelernounsomeone who walks unsteadily as if about to fallverifiedMay 18, 2026
Reenactmentnounperforming a role in an event that occurred at an earlier timeverifiedMay 18, 2026
Reenactornouna person who enacts a role in an event that occurred earlierverifiedMay 18, 2026
Reenforcementnouna military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its missionverifiedMay 18, 2026
Reenlistmentnouna renewed enlistmentverifiedMay 18, 2026
Reentering AnglenounMWEan interior angle of a polygon that is greater than 180 degreesverifiedMay 18, 2026
Reentrant AnglenounMWEan interior angle of a polygon that is greater than 180 degreesverifiedMay 18, 2026
Reentrant PolygonnounMWEa polygon with one or more reentrant anglesverifiedMay 18, 2026
Reentrynounthe act of entering againverifiedMay 18, 2026
Reevaluationnounthe evaluation of something a second time (or more)verifiedMay 18, 2026
Reexaminationnoun(law) questioning of a witness by the party that called the witness after that witness has been subject to cross-examinationverifiedMay 18, 2026
Refnoun(sports) the chief official (as in boxing or American football) who is expected to ensure fair playverifiedMay 18, 2026
Refabricationnounassembling againverifiedMay 18, 2026
Refectionnouna light meal or repastverifiedMay 18, 2026
Refectorynouna communal dining-hall (usually in a monastery)verifiedMay 18, 2026
Refectory TablenounMWEa long narrow dining table supported by a stretcher between two trestlesverifiedMay 18, 2026
Refereeingnounthe act of umpiringverifiedMay 18, 2026
Reference BooknounMWEa book to which you can refer for authoritative factsverifiedMay 18, 2026
Reference ClassnounMWEA class which is intended to describe structure and behavior of object identifiers. Its instances, called references, are passed by-value and indirectly represent objects by substituting for some primitive reference.ArtifactMay 18, 2026
Reference FramenounMWEa system that uses coordinates to establish positionverifiedMay 18, 2026
Reference GridnounMWEa pattern of horizontal and vertical lines that provide coordinates for locating points on an image or a mapverifiedMay 18, 2026
Reference ManualnounMWEa manual containing information organized in a summary mannerverifiedMay 18, 2026
Reference MonitornounMWEThe security engineering term for IT functionality that— 1) controls all access, 2) cannot be bypassed, 3) is tamper-resistant, and 4) provides confidence that the other three items are true.ControlMay 9, 2026
Reference PointnounMWEan indicator that orients you generallyverifiedMay 18, 2026
Reference SystemnounMWEa system that uses coordinates to establish positionverifiedMay 18, 2026
Reference WorknounMWEa book to which you can refer for authoritative factsverifiedMay 18, 2026
Referendumnouna legislative act is referred for final approval to a popular vote by the electorateverifiedMay 18, 2026
Referralnounthe act of referring (as forwarding an applicant for employment or referring a matter to an appropriate agency)verifiedMay 18, 2026
Referred PainnounMWEpain that is felt at a place in the body different from the injured or diseased part where the pain would be expectedverifiedMay 18, 2026
Refillingnounfilling again by supplying what has been used upverifiedMay 18, 2026
Refined SugarnounMWEa white crystalline carbohydrate used as a sweetener and preservativeverifiedMay 18, 2026
Refinementnounthe process of removing impurities (as from oil or metals or sugar etc.)verifiedMay 18, 2026
Refinernounone whose work is to refine a specific thingverifiedMay 18, 2026
Refinerynounan industrial plant for purifying a crude substanceverifiedMay 18, 2026
Refiningnounthe process of removing impurities (as from oil or metals or sugar etc.)verifiedMay 18, 2026
Refining IndustrynounMWEan industry that produces and delivers oil and oil productsverifiedMay 18, 2026
Refinishernouna skilled worker who is employed to restore or refinish buildings or antique furnitureverifiedMay 18, 2026
Reflationnouninflation of currency after a period of deflationverifiedMay 18, 2026
Reflectancenounthe fraction of radiant energy that is reflected from a surfaceverifiedMay 18, 2026
Reflecting TelescopenounMWEoptical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepieceverifiedMay 18, 2026
Reflectionnounthe phenomenon of a propagating wave (light or sound) being thrown back from a surfaceverifiedMay 18, 2026
Reflection FactornounMWEthe fraction of radiant energy that is reflected from a surfaceverifiedMay 18, 2026
Reflective PowernounMWEthe ratio of reflected to incident lightverifiedMay 18, 2026
Reflectivenessnounthe capability of quiet thought or contemplationverifiedMay 18, 2026
Reflectivitynounthe fraction of radiant energy that is reflected from a surfaceverifiedMay 18, 2026
Reflectometernouna meter that measures the reflectance of a surfaceverifiedMay 18, 2026
Reflectornounoptical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepieceverifiedMay 18, 2026
Reflex ActionnounMWEan automatic instinctive unlearned reaction to a stimulusverifiedMay 18, 2026
Reflex AnglenounMWEan angle greater than 180 degrees (but less than 360)verifiedMay 18, 2026
Reflex ArcnounMWEthe neural path of a reflexverifiedMay 18, 2026
Reflex CameranounMWEcamera that allows the photographer to view and focus the exact scene being photographedverifiedMay 18, 2026
Reflex EpilepsynounMWEa form of epilepsy in which attacks are induced by peripheral stimulationverifiedMay 18, 2026
Reflex ResponsenounMWEan automatic instinctive unlearned reaction to a stimulusverifiedMay 18, 2026
Reflexionnounthe phenomenon of a propagating wave (light or sound) being thrown back from a surfaceverifiedMay 18, 2026
Reflexive ACLsnounMWEReflexive ACLs for Cisco routers are a step towards making the router act like a stateful firewall. The router will make filtering decisions based on whether connections are a part of established traffic or not.ControlMay 12, 2026
Reflexive PronounnounMWEa personal pronoun compounded with -self to show the agent's action affects the agentverifiedMay 18, 2026
Reflexive VerbnounMWEa verb whose agent performs an action that is directed at the agentverifiedMay 18, 2026
Reflexivenessnoun(logic and mathematics) a relation such that it holds between an element and itselfverifiedMay 18, 2026
Reflexivitynounin qualitative research, the self-referential quality of a study in which the researcher reflects on the assumptions behind the study and especially the influence of his or her own motives, history, and biases on its conduct.CapabilityMay 18, 2026
Reflexologynounthe study of reflex action as it relates to the behavior of organismsverifiedMay 18, 2026
Refluxnounan abnormal backward flow of body fluidsverifiedMay 18, 2026
Reflux CondensernounMWEcondenser such that vapor over a boiling liquid is condensed and flows back into the vessel to prevent its contents from boiling dryverifiedMay 18, 2026
Refocusingnounfocusing againverifiedMay 18, 2026
Reforestationnounthe restoration (replanting) of a forest that had been reduced by fire or cuttingverifiedMay 18, 2026
Reform MovementnounMWEa movement intended to bring about social and humanitarian reformsverifiedMay 18, 2026
Reform SchoolnounMWEcorrectional institution for the detention and discipline and training of young or first offendersverifiedMay 18, 2026
Reformationnounimprovement (or an intended improvement) in the existing form or condition of institutions or practices etc.verifiedMay 18, 2026
Reformernounan apparatus that reforms the molecular structure of hydrocarbons to produce richer fuelverifiedMay 18, 2026
Reformismnouna doctrine of reformverifiedMay 18, 2026
Refracting TelescopenounMWEoptical telescope that has a large convex lens that produces an image that is viewed through the eyepieceverifiedMay 18, 2026
Refractionnounthe change in direction of a propagating wave (light or sound) when passing from one medium to anotherverifiedMay 18, 2026
Refractive IndexnounMWEthe ratio of the velocity of light in a vacuum to that in a mediumverifiedMay 18, 2026
Refractivenessnounthe physical property of a medium as determined by its index of refractionverifiedMay 18, 2026
Refractivitynounthe physical property of a medium as determined by its index of refractionverifiedMay 18, 2026
Refractometernounmeasuring instrument for measuring the refractive index of a substanceverifiedMay 18, 2026
Refractorinessnounthe trait of being unmanageableverifiedMay 18, 2026
Refractory AnemianounMWEany of various anemic conditions that are not successfully treated by any means other than blood transfusions (and that are not associated with another primary disease)verifiedMay 18, 2026
Refractory PeriodnounMWE(neurology) the time after a neuron fires or a muscle fiber contracts during which a stimulus will not evoke a responseverifiedMay 18, 2026
Refractory PotnounMWEa small porous bowl made of bone ash used in assaying to separate precious metals from e.g. leadverifiedMay 18, 2026
Refreshernouna fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one dayverifiedMay 18, 2026
Refresher CoursenounMWEa course that reviews and updates a topic for those who have not kept abreast of developmentsverifiedMay 18, 2026
Refreshmentnounsnacks and drinks served as a light mealverifiedMay 18, 2026
Refried BeansnounMWEdried beans cooked and mashed and then fried in lard with various seasoningsverifiedMay 18, 2026
Refrigerationnounthe process of cooling or freezing (e.g., food) for preservative purposesverifiedMay 18, 2026
Refrigeration SystemnounMWEa cooling system for chilling or freezing (usually for preservative purposes)verifiedMay 18, 2026
Refrigeratornounwhite goods in which food can be stored at low temperaturesverifiedMay 18, 2026