Glossary · Nouns · R
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TermTypeDefinitionClassificationsUpdated
Radiologistnouna medical specialist who uses radioactive substances and X-rays in the treatment of diseaseverified
Radiologynoun(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiationverified
Radiopharmaceuticalnounpharmaceutical consisting of a radioactive compound used in radiation therapyverified
Radioscopynoun(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiationverified
Radiotherapistnouna medical specialist who uses radioactive substances and X-rays in the treatment of diseaseverified
Radiotherapynoun(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substanceverified
Radiumnounan intensely radioactive metallic element that occurs in minute amounts in uranium oresverified
Radiusnouna straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)verified
Radius VectornounMWEa line connecting a satellite to the center of the body around which it is rotatingverified
Radixnoun(numeration system) the positive integer that is equivalent to one in the next higher counting placeverified
Raffia PalmnounMWEa large feather palm of Africa and Madagascar having very long pinnatisect fronds yielding a strong commercially important fiber from its leafstalksverified
Raffinosenouna trisaccharide that occurs in sugar beets and cotton seeds and certain cerealsverified
Raft FoundationnounMWEa foundation (usually on soft ground) consisting of an extended layer of reinforced concreteverified
Rag GourdnounMWEany of several tropical annual climbers having large yellow flowers and edible young fruitsverified
Rag WeeknounMWEa week at British universities during which side-shows and processions of floats are organized to raise money for charitiesverified
RageenounEast Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orientverified
Ragged OrchidnounMWEfringed orchid of the eastern United States having a greenish flower with the lip deeply laceratedverified
Ragged OrchisnounMWEfringed orchid of the eastern United States having a greenish flower with the lip deeply laceratedverified
Ragged RobinnounMWEcommon perennial native to Europe and western Asia having usually pink flowers with ragged petalsverified
Ragged-Fringed OrchidnounMWEfringed orchid of the eastern United States having a greenish flower with the lip deeply laceratedverified
RaginounEast Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orientverified
Raglan SleevenounMWEa sleeve that extends in one piece to the neckline of a coat or sweater with seams from the armhole to the neckverified
Ragpickernounan unskilled person who picks up rags from trash cans and public dumps as a means of livelihoodverified
Ragpicker's DiseasenounMWEa form of anthrax infection acquired by inhalation of dust containing Bacillus anthracisverified
Ragsorter's DiseasenounMWEa form of anthrax infection acquired by inhalation of dust containing Bacillus anthracisverified
Ragweednounany of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthmaverified
Raidernouna corporate investor who intends to take over a company by buying a controlling interest in its stock and installing new managementverified
Railheadnouna railroad depot in a theater of operations where military supplies are unloaded for distributionverified
Railroad LinenounMWEline that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freightverified
Railroad SidingnounMWEa short stretch of railroad track used to store rolling stock or enable trains on the same line to passverified
Railroad TrainnounMWEpublic transport provided by a line of railway cars coupled together and drawn by a locomotiveverified
Railwaynounline that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freightverified