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Glossary · Nouns · R

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TermTypeDefinitionClassificationsUpdated
Rockweednouncoarse brown seaweed growing on rocks exposed at low tideverifiedMay 18, 2026
Rodnouna visual receptor cell that is sensitive to dim lightverifiedMay 18, 2026
Rod CellnounMWEa visual receptor cell that is sensitive to dim lightverifiedMay 18, 2026
Rodentnounrelatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawingverifiedMay 18, 2026
Rodeonounan enclosure for cattle that have been rounded upverifiedMay 18, 2026
Rodeo RidernounMWEa performer who gives exhibitions of riding and roping and bulldoggingverifiedMay 18, 2026
Rodomontadenounvain and empty boastingverifiedMay 18, 2026
Roenounthe egg mass or spawn of certain crustaceans such as the lobsterverifiedMay 18, 2026
Roe DeernounMWEsmall graceful deer of Eurasian woodlands having small forked antlersverifiedMay 18, 2026
Roebucknounmale roe deerverifiedMay 18, 2026
Roentgennouna unit of radiation exposureverifiedMay 18, 2026
Roentgen RaynounMWEelectromagnetic radiation of short wavelength produced when high-speed electrons strike a solid targetverifiedMay 18, 2026
Roentgeniumnouna radioactive transuranic elementverifiedMay 18, 2026
Roentgenogramnouna radiogram made by exposing photographic film to X raysverifiedMay 18, 2026
Roentgenographynounradiography that uses X-rays to produce a roentgenogramverifiedMay 18, 2026
Roentgenoscopenounan X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observationverifiedMay 18, 2026
Rofecoxibnouna Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tractverifiedMay 18, 2026
Rogationnouna solemn supplication ceremony prescribed by the churchverifiedMay 18, 2026
Roguenouna deceitful and unreliable scoundrelverifiedMay 18, 2026
Rogue DevicenounMWEAn unauthorized node on a network.ThreatMay 9, 2026
Rogue ElephantnounMWEa wild and vicious elephant separated from the herdverifiedMay 18, 2026
Rogue NationnounMWEa state that does not respect other states in its international actionsverifiedMay 18, 2026
Rogue StatenounMWEa state that does not respect other states in its international actionsverifiedMay 18, 2026
Rogue wireless accessnounMWEAn unauthorized wireless node on a network.ThreatRestrictedMay 12, 2026
Rogue's GallerynounMWEa collection of pictures of criminalsverifiedMay 18, 2026
Roguerynounreckless or malicious behavior that causes discomfort or annoyance in othersverifiedMay 18, 2026
Roguishnessnounreckless or malicious behavior that causes discomfort or annoyance in othersverifiedMay 18, 2026
Roinoun(corporate finance) the amount, expressed as a percentage, that is earned on a company's total capital calculated by dividing the total capital into earnings before interest, taxes, or dividends are paidverifiedMay 18, 2026
Roisterernounan especially noisy and unrestrained merrymakerverifiedMay 18, 2026
rolenounA group attribute that ties membership to function. When an entity assumes a role, the entity is given certain rights that belong to that role. When the entity leaves the role, those rights are removed. The rights given are consistent with the functionality that the entity needs to perform the expected tasks.RoleMay 9, 2026
Role Based Access ControlnounMWERole based access control assigns users to roles based on their organizational functions and determines authorization based on those roles.ControlMay 9, 2026
Role ModelnounMWEsomeone worthy of imitationverifiedMay 18, 2026
Role PlayernounMWEa person who makes deceitful pretensesverifiedMay 18, 2026
Roleplayingnounacting a particular roleverifiedMay 18, 2026
roles and responsibilitiesnounMWEThe position and collection of tasks, duties, obligations that participants undertake to complete a project.RequirementMay 9, 2026
Roll CallnounMWEcalling out an official list of namesverifiedMay 18, 2026
Roll FilmnounMWEphotographic film wound on a spoolverifiedMay 18, 2026
Roll in the HaynounMWEslang for sexual intercourseverifiedMay 18, 2026
Roll of TobacconounMWEtobacco leaves that have been made into a cylinderverifiedMay 18, 2026
Roll-Onnouna dispenser of a liquid cosmetic (such as a deodorant) having a revolving ball as an applicatorverifiedMay 18, 2026
Roll-On Roll-OffnounMWEa method of transport (as a ferry or train or plane) that vehicles roll onto at the beginning and roll off of at the destinationverifiedMay 18, 2026
Rollbacknounreducing prices back to some earlier levelverifiedMay 18, 2026
Rolled BiscuitnounMWEbiscuit made from dough rolled and cutverifiedMay 18, 2026
Rolled OatsnounMWEmeal made from rolled or ground oatsverifiedMay 18, 2026
Rollernouna mechanical device consisting of a cylindrical tube around which the hair is wound to curl itverifiedMay 18, 2026
Roller BandagenounMWEbandage consisting of a strip of sterile fabric (of variable width) rolled into a cylinder to facilitate applicationverifiedMay 18, 2026
Roller BearingnounMWEbearings containing small metal ballsverifiedMay 18, 2026
Roller BitnounMWEa drill bit that has hardened rotating rollersverifiedMay 18, 2026
Roller BlindnounMWEa window shade that rolls up out of the wayverifiedMay 18, 2026
Roller CoasternounMWEelevated railway in an amusement park (usually with sharp curves and steep inclines)verifiedMay 18, 2026
Roller SkatenounMWEa shoe with pairs of rollers fixed to the soleverifiedMay 18, 2026
Roller SkatingnounMWEskating on wheelsverifiedMay 18, 2026
Roller TowelnounMWEa towel with the ends sewn together, hung on a rollerverifiedMay 18, 2026
Roller-Skaternounsomeone who engages in roller skatingverifiedMay 18, 2026
Rollerbladernouna skater who uses RollerbladesverifiedMay 18, 2026
Rollerbladingnounskating using RollerbladesverifiedMay 18, 2026
Rolling HitchnounMWEa hitch for fastening a line to a spar or another ropeverifiedMay 18, 2026
Rolling MillnounMWEsteel mill where metal is rolled into sheets and barsverifiedMay 18, 2026
Rolling PapernounMWEa strong tissue paper that burns evenly and is sufficiently porous to control the burning of the tobacco in a cigaretteverifiedMay 18, 2026
Rolling PinnounMWEutensil consisting of a cylinder (usually of wood) with a handle at each endverifiedMay 18, 2026
Rolling StocknounMWEcollection of wheeled vehicles owned by a railroad or motor carrierverifiedMay 18, 2026
Rolling WavenounMWEa long heavy sea wave as it advances towards the shoreverifiedMay 18, 2026
Rollmopsnouna pickled herring filet that has been rolled or wrapped around a pickleverifiedMay 18, 2026
Roly-Poly PuddingnounMWEpudding made of suet pastry spread with jam or fruit and rolled up and baked or steamedverifiedMay 18, 2026
Rolypolinessnounthe property of having a plump and round bodyverifiedMay 18, 2026
Romainenounlettuce with long dark-green leaves in a loosely packed elongated headverifiedMay 18, 2026
Romaine LettucenounMWElettuce with long dark-green leaves in a loosely packed elongated headverifiedMay 18, 2026
Roman a ClefnounMWEa novel in which actual persons and events are disguised as fictional charactersverifiedMay 18, 2026
Roman ArchnounMWEa round arch drawn from a single centerverifiedMay 18, 2026
Roman CandlenounMWEa cylindrical firework that projects a series of colored balls of fireverifiedMay 18, 2026
Roman CollarnounMWEa stiff white collar with no opening in the frontverifiedMay 18, 2026
Roman FleuvenounMWEa French novel in the form of a long chronicle of a family or other social groupverifiedMay 18, 2026
Roman LettersnounMWEa typeface used in ancient Roman inscriptionsverifiedMay 18, 2026
Roman NosenounMWEa nose with a prominent slightly aquiline bridgeverifiedMay 18, 2026
Roman NumeralnounMWEa symbol in the old Roman notationverifiedMay 18, 2026
Roman PrintnounMWEa typeface used in ancient Roman inscriptionsverifiedMay 18, 2026
Roman TypenounMWEa typeface used in ancient Roman inscriptionsverifiedMay 18, 2026
Romantic RealismnounMWEthe first coherent school of American artverifiedMay 18, 2026
Romanticisationnounthe act of indulging in sentimentverifiedMay 18, 2026
Romanticismnounan exciting and mysterious quality (as of a heroic time or adventure)verifiedMay 18, 2026
Romanticizationnounthe act of indulging in sentimentverifiedMay 18, 2026
Romeonounan ardent male loververifiedMay 18, 2026
Rompernouna one-piece garment for children to wear at playverifiedMay 18, 2026
Romper SuitnounMWEa one-piece garment for children to wear at playverifiedMay 18, 2026
Rondeaunouna French verse form of 10 or 13 lines running on two rhymesverifiedMay 18, 2026
Rondelnouna French verse form of 10 or 13 lines running on two rhymesverifiedMay 18, 2026
Rondeletnouna shorter form of rondeauverifiedMay 18, 2026
Rondonouna musical form that is often the last movement of a sonataverifiedMay 18, 2026
Roodnounrepresentation of the cross on which Jesus diedverifiedMay 18, 2026
Rood ScreennounMWEa screen in a churchverifiedMay 18, 2026
Rood-Treenounrepresentation of the cross on which Jesus diedverifiedMay 18, 2026
Roof GardennounMWEa garden on a flat roof of a buildingverifiedMay 18, 2026
Roof MushroomnounMWEa large genus of fungi belonging to the family PluteaceaeverifiedMay 18, 2026
Roof of the MouthnounMWEthe upper surface of the mouth that separates the oral and nasal cavitiesverifiedMay 18, 2026
Roof PeaknounMWEthe highest point of a roofverifiedMay 18, 2026
Roof RacknounMWEcarrier for holding luggage above the seats of a train or on top of a carverifiedMay 18, 2026
Roof RatnounMWEcommon household pest originally from Asia that has spread worldwideverifiedMay 18, 2026
Roofernouna craftsman who lays or repairs roofsverifiedMay 18, 2026
Roofingnounmaterial used to construct a roofverifiedMay 18, 2026
Roofing MaterialnounMWEbuilding material used in constructing roofsverifiedMay 18, 2026