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Glossary · Nouns · R

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TermTypeDefinitionClassificationsUpdated
Roofing PapernounMWEa heavy paper impregnated with tar and used as part of a roof for waterproofingverifiedMay 18, 2026
Roofing TilenounMWEa thin flat slab of fired clay used for roofingverifiedMay 18, 2026
Rooftopnounthe top of a usually flat roofverifiedMay 18, 2026
Rooftreenouna beam laid along the edge where two sloping sides of a roof meet at the topverifiedMay 18, 2026
Roofynounstreet names for flunitrazepanverifiedMay 18, 2026
RooibosnounSouth African shrub having flat acuminate leaves and yellow flowersverifiedMay 18, 2026
Rookerynouna breeding ground for gregarious birds, such as rooksverifiedMay 18, 2026
Rookienounan awkward and inexperienced youthverifiedMay 18, 2026
Room AccessnounMWEthe entrance (the space in a wall) through which you enter or leave a room or buildingverifiedMay 18, 2026
Room ClerknounMWEa hotel clerk who is responsible for room assignments to guestsverifiedMay 18, 2026
Room DecoratornounMWEa person who specializes in designing architectural interiors and their furnishingsverifiedMay 18, 2026
Room LightnounMWElight that provides general illumination for a roomverifiedMay 18, 2026
Room RatenounMWEthe rate charged daily for a hotel roomverifiedMay 18, 2026
Room TemperaturenounMWEthe normal temperature of room in which people liveverifiedMay 18, 2026
Roomernouna tenant in someone's houseverifiedMay 18, 2026
Roomettenouna small private compartment for one on a sleeping carverifiedMay 18, 2026
Roomfulnounthe quantity a room will holdverifiedMay 18, 2026
Roomienounan associate who shares a room with youverifiedMay 18, 2026
Roominessnounspatial largeness and extensiveness (especially inside a building)verifiedMay 18, 2026
Rooming HousenounMWEa house where rooms are rentedverifiedMay 18, 2026
Roommatenounan associate who shares a room with youverifiedMay 18, 2026
Roosternounadult male chickenverifiedMay 18, 2026
RootnounRoot is the name of the administrator account in Unix systems.IdentityMay 9, 2026
Root BeernounMWEcarbonated drink containing extracts of roots and herbsverifiedMay 18, 2026
Root Beer FloatnounMWEan ice-cream soda made with ice cream floating in root beerverifiedMay 18, 2026
Root CanalnounMWEthe passage in the root of a tooth through which its nerve and blood vessels enter the pulp cavityverifiedMay 18, 2026
Root CapnounMWEthimble-shaped mass of cells covering and protecting the growing tip of a rootverifiedMay 18, 2026
root causenounMWEThe underlying or original source of an incident or problem.ArtifactMay 9, 2026
Root cause analysisnounMWEA principle-based, systems approach for the identification of underlying causes associated with a particular set of risks.ProcessMay 9, 2026
Root CelerynounMWEgrown for its thickened edible aromatic rootverifiedMay 18, 2026
Root CellarnounMWEan excavation where root vegetables are storedverifiedMay 18, 2026
Root Certification AuthoritynounMWEIn a hierarchical Public Key Infrastructure, the Certification Authority whose public key serves as the most trusted datum (i.e., the beginning of trust paths) for a security domain.CredentialRestrictedMay 9, 2026
Root ClimbernounMWEa plant that climbs by its adventitious roots e.g. ivyverifiedMay 18, 2026
Root CropnounMWEcrop grown for its enlarged roots: e.g. beetsverifiedMay 18, 2026
Root HairnounMWEthin hairlike outgrowth of an epidermal cell just behind the tipverifiedMay 18, 2026
Root RotnounMWEdisease characterized by root decayverifiedMay 18, 2026
Root SystemnounMWEa developed system of rootsverifiedMay 18, 2026
Root VegetablenounMWEany of various fleshy edible underground roots or tubersverifiedMay 18, 2026
Root WordnounMWE(linguistics) the form of a word after all affixes are removedverifiedMay 18, 2026
Root-Mean-Square Deviation (RMSD)nounMWEof an estimator of a parameter[; ...] the square-root of the mean squared error (MSE) of the estimator. In symbols, if X is an estimator of the parameter t, then RMSE(X) = ( E( (X−t)2 ) )½. The RMSE of an estimator is a measure of the expected error of the estimator. The units of RMSE are the same as the units of the estimator.FindingMay 18, 2026
Rootagenounthe place where something begins, where it springs into beingverifiedMay 18, 2026
Rooternounan enthusiastic devotee of sportsverifiedMay 18, 2026
Rooter SkunknounMWElarge naked-muzzled skunk with white back and tailverifiedMay 18, 2026
Rootingnounthe process of putting forth roots and beginning to growverifiedMay 18, 2026
Rooting ReflexnounMWEreflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheekverifiedMay 18, 2026
RootkitnounA set of tools used by an attacker after gaining root-level access to a host to conceal the attacker’s activities on the host and permit the attacker to maintain root-level access to the host through covert means.ThreatMay 9, 2026
Rootletnounsmall root or division of a rootverifiedMay 18, 2026
Rootstalknouna horizontal plant stem with shoots above and roots below serving as a reproductive structureverifiedMay 18, 2026
Rootstocknouna horizontal plant stem with shoots above and roots below serving as a reproductive structureverifiedMay 18, 2026
Rope BridgenounMWEa bridge consisting of ropesverifiedMay 18, 2026
Rope BurnnounMWEabrasion (usually on the hands) caused by friction from a ropeverifiedMay 18, 2026
Rope LaddernounMWEa ladder with side pieces of ropeverifiedMay 18, 2026
Rope TownounMWEa ski tow offering only a moving rope to hold ontoverifiedMay 18, 2026
Rope YardnounMWEworkplace consisting of a long narrow path or shed where rope is madeverifiedMay 18, 2026
Rope-A-Dopenouna boxing tactic: pretending to be trapped against the ropes while your opponent wears himself out throwing punchesverifiedMay 18, 2026
Ropebarknoundeciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowersverifiedMay 18, 2026
Ropedancernounan acrobat who performs on a rope stretched at some height above the groundverifiedMay 18, 2026
Ropemakernouna craftsman who makes ropesverifiedMay 18, 2026
Ropernouna decoy who lures customers into a gambling establishment (especially one with a fixed game)verifiedMay 18, 2026
Ropewalknounworkplace consisting of a long narrow path or shed where rope is madeverifiedMay 18, 2026
Ropewalkernounan acrobat who performs on a rope stretched at some height above the groundverifiedMay 18, 2026
Ropewaynouna conveyance that transports passengers or freight in carriers suspended from cables and supported by a series of towersverifiedMay 18, 2026
Rophynounstreet names for flunitrazepanverifiedMay 18, 2026
Ropinessnounthe property of being cohesive and stickyverifiedMay 18, 2026
Ropingnouncapturing cattle or horses with a lassoverifiedMay 18, 2026
RoquefortnounFrench blue cheeseverifiedMay 18, 2026
Roquettenounerect European annual often grown as a salad crop to be harvested when young and tenderverifiedMay 18, 2026
Roridulanouneither of 2 species of the genus RoridulaverifiedMay 18, 2026
Rorqualnounany of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal finverifiedMay 18, 2026
Rorschachnouna projective tests using bilaterally symmetrical inkblotsverifiedMay 18, 2026
Rorschach TestnounMWEa projective tests using bilaterally symmetrical inkblotsverifiedMay 18, 2026
Rosaceanouna skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearanceverifiedMay 18, 2026
Rosarynouna string of beads used in counting prayers (especially by Catholics)verifiedMay 18, 2026
Rose AcacianounMWElarge shrub or small tree of the eastern United States having bristly stems and large clusters of pink flowersverifiedMay 18, 2026
Rose ApplenounMWEfragrant oval yellowish tropical fruit used in jellies and confectionsverifiedMay 18, 2026
Rose BaynounMWEan ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regionsverifiedMay 18, 2026
Rose BednounMWEa flower bed in which roses are growingverifiedMay 18, 2026
Rose BeetlenounMWEa common metallic green European beetle: larvae feed on plant roots and adults on leaves and flowers of e.g. rosesverifiedMay 18, 2026
Rose BugnounMWEcommon North American beetle: larvae feed on roots and adults on leaves and flowers of e.g. rose bushes or apple trees or grape vinesverifiedMay 18, 2026
Rose CampionnounMWEan old cottage garden plant of southeastern Europe widely cultivated for its attractive white woolly foliage and showy crimson flowersverifiedMay 18, 2026
Rose ChafernounMWEcommon North American beetle: larvae feed on roots and adults on leaves and flowers of e.g. rose bushes or apple trees or grape vinesverifiedMay 18, 2026
Rose ChestnutnounMWEhandsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfumeverifiedMay 18, 2026
Rose FamilynounMWEa large family of dicotyledonous plants of order RosalesverifiedMay 18, 2026
Rose GardennounMWEa garden for growing rosesverifiedMay 18, 2026
Rose GeraniumnounMWEany of several southern African geraniums having fragrant three-lobed to five-lobed leaves and pink flowersverifiedMay 18, 2026
Rose Globe LilynounMWEglobe lily with deep rose-pink or purple egg-shaped flowers on flexuous stemsverifiedMay 18, 2026
Rose GumnounMWEvery tall tree of Queensland and New South WalesverifiedMay 18, 2026
Rose HipnounMWEthe fruit of a rose plantverifiedMay 18, 2026
Rose LeeknounMWENorth American bulbous plantverifiedMay 18, 2026
Rose MallownounMWEshowy shrub of salt marshes of the eastern United States having large rose-colored flowersverifiedMay 18, 2026
Rose MossnounMWEwidely cultivated in many varieties for its fleshy moss-like foliage and profusion of brightly colored flowersverifiedMay 18, 2026
Rose of JerichonounMWEsmall grey Asiatic desert plant bearing minute white flowers that rolls up when dry and expands when moistverifiedMay 18, 2026
Rose of SharonnounMWEAsiatic shrub or small shrubby tree having showy bell-shaped rose or purple or white flowers and usually three-lobed leavesverifiedMay 18, 2026
Rose OilnounMWEa volatile fragrant oil obtained from fresh roses by steam distillationverifiedMay 18, 2026
Rose PeriwinklenounMWEcommonly cultivated Old World woody herb having large pinkish to red flowersverifiedMay 18, 2026
Rose PinknounMWEany of several pink-flowered marsh plant of the eastern United States resembling a true centauryverifiedMay 18, 2026
Rose QuartznounMWEa translucent rose-red variety of quartz used for ornamentsverifiedMay 18, 2026
Rose WaternounMWEperfume consisting of water scented with oil of rosesverifiedMay 18, 2026
Rose WindownounMWEcircular window filled with traceryverifiedMay 18, 2026
Rose WinenounMWEpinkish table wine from red grapes whose skins were removed after fermentation beganverifiedMay 18, 2026