| radiological | (adjective) of or relating to radiology | - |
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| radiologist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiotherapist |
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| radiology | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radioscopy |
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| (noun) the branch of medical science dealing with the medical use of X-rays or other penetrating radiation | - |
| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| radiolysis | (noun) molecular disintegration resulting from radiation | - |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| radiopacity | (noun) opacity to X-rays or other radiation | Synonyms: radio-opacity |
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| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| radiopharmaceutical | (noun) pharmaceutical consisting of a radioactive compound used in radiation therapy | - |
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| radiophone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiotelephone, wireless telephone |
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| radiophonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiotelephonic |
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| radiophoto | (noun) a photograph transmitted by radio waves | Synonyms: radiophotograph |
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| radiophotograph | (noun) a photograph transmitted by radio waves | Synonyms: radiophoto |
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| radiophotography | (noun) transmission of photographs by radio waves | - |
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| radioprotection | (noun) protection against harmful effects of radiation | - |
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| radioscopy | (noun) (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation | Synonyms: radiology |
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| radiosensitive | (adjective) sensitive to radiation | - |
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| radiosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: photosensitivity |
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| radiotelegraph | (noun) the use of radio to send telegraphic messages (usually by Morse code) | Synonyms: radiotelegraphy, wireless telegraph, wireless telegraphy |
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| (noun) telegraphy that uses transmission by radio rather than by wire | Synonyms: radiotelegraphy, wireless telegraphy |
| radiotelegraphy | (noun) the use of radio to send telegraphic messages (usually by Morse code) | Synonyms: radiotelegraph, wireless telegraph, wireless telegraphy |
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| (noun) telegraphy that uses transmission by radio rather than by wire | Synonyms: radiotelegraph, wireless telegraphy |
| radiotelephone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiophone, wireless telephone |
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| (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephony, wireless telephone |
| radiotelephonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiophonic |
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| radiotelephony | (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephone, wireless telephone |
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| radiotherapist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiologist |
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| radiotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation, radiation therapy |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| radish | (noun) pungent fleshy edible root | - |
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| (noun) Eurasian plant widely cultivated for its edible pungent root usually eaten raw | Synonyms: Raphanus sativus |
| (noun) pungent edible root of any of various cultivated radish plants | - |
| (noun) radish of Japan with a long hard durable root eaten raw or cooked | Synonyms: daikon, Japanese radish, Raphanus sativus longipinnatus |
| (noun) a cruciferous plant of the genus Raphanus having a pungent edible root | Synonyms: radish plant |
| radium | (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores | Synonyms: atomic number 88, Ra |
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| radius | (noun) support consisting of a radial member of a wheel joining the hub to the rim | Synonyms: spoke, wheel spoke |
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| (noun) the length of a line segment between the center and circumference of a circle or sphere | Synonyms: r |
| (noun) the outer and slightly shorter of the two bones of the human forearm | - |
| (noun) a circular region whose area is indicated by the length of its radius | - |
| (noun) a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) | - |
| radix | (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: base |
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| radome | (noun) a housing for a radar antenna; transparent to radio waves | Synonyms: radar dome |
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| radon | (noun) a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health | Synonyms: atomic number 86, Rn |
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| raetam | (noun) desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista | Synonyms: Genista raetam, juniper, juniper bush, Retama raetam, retem |
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| raffia | (noun) fiber of a raffia palm used as light cordage and in making hats and baskets | - |
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| (noun) leaf fibers of the raffia palm tree; used to make baskets and mats etc. | Synonyms: raphia |
| raffinose | (noun) a trisaccharide that occurs in sugar beets and cotton seeds and certain cereals | - |
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| raffish | (adjective) marked by up-to-dateness in dress and manners | Synonyms: dapper, dashing, jaunty, natty, rakish, snappy, spiffy, spruce |
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| (adjective) marked by a carefree unconventionality or disreputableness | Synonyms: devil-may-care, rakish |
| raffishly | (adverb) in a rakish manner | Synonyms: carelessly, rakishly |
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| raffle | (noun) a lottery in which the prizes are goods rather than money | - |
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| (verb) dispose of in a lottery | Synonyms: raffle off |
| raft | (noun) a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers | - |
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| (noun) a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete | Synonyms: mat, raft foundation |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, sight, slew, spate, stack, tidy sum, wad |
| (verb) make into a raft | - |
| (verb) travel by raft in water | - |
| (verb) transport on a raft | - |
| rafter | (noun) one of several parallel sloping beams that support a roof | Synonyms: balk, baulk |
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| (noun) someone who travels by raft | Synonyms: raftman, raftsman |
| (verb) provide (a ceiling) with rafters | - |
| raftered | (adjective) having the rafters especially having them visible | - |
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| raftman | (noun) someone who travels by raft | Synonyms: rafter, raftsman |
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| rafts | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, oodles, piles, scads, scores, slews, stacks, tons, wads |
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| raftsman | (noun) someone who travels by raft | Synonyms: rafter, raftman |
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| rag | (noun) a boisterous practical joke (especially by college students) | - |
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| (noun) a small piece of cloth | Synonyms: shred, tag, tag end, tatter |
| (noun) newspaper with half-size pages | Synonyms: sheet, tabloid |
| (noun) music with a syncopated melody (usually for the piano) | Synonyms: ragtime |
| (noun) a week at British universities during which side-shows and processions of floats are organized to raise money for charities | Synonyms: rag week |
| (verb) break into lumps before sorting | - |
| (verb) censure severely or angrily | Synonyms: bawl out, berate, call down, call on the carpet, chew out, chew up, chide, dress down, have words, jaw, lambast, lambaste, lecture, rebuke, remonstrate, reprimand, scold, take to task, trounce |
| (verb) harass with persistent criticism or carping | Synonyms: bait, cod, rally, razz, ride, tantalise, tantalize, taunt, tease, twit |
| (verb) play in ragtime | - |
| (verb) treat cruelly | Synonyms: bedevil, crucify, dun, frustrate, torment |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rile, vex |
| ragamuffin | (noun) a dirty shabbily clothed urchin | Synonyms: tatterdemalion |
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| ragbag | (noun) a bag in which rags are kept | - |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum |
| rage | (noun) an interest followed with exaggerated zeal | Synonyms: craze, cult, fad, furor, furore |
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| (noun) a feeling of intense anger | Synonyms: fury, madness |
| (noun) a state of extreme anger | - |
| (noun) violent state of the elements | - |
| (noun) something that is desired intensely | Synonyms: passion |
| (verb) feel intense anger | - |
| (verb) be violent; as of fires and storms | - |
| (verb) behave violently, as if in state of a great anger | Synonyms: ramp, storm |
| ragee | (noun) East Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orient | Synonyms: African millet, coracan, corakan, Eleusine coracana, finger millet, kurakkan, ragi |
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| ragged | (adjective) worn out from stress or strain | - |
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| (adjective) having an irregular outline | - |
| (adjective) being or dressed in clothes that are worn or torn | - |
| raggedly | (adverb) with a ragged and uneven appearance | Synonyms: jaggedly |
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| (adverb) in a ragged irregular manner | Synonyms: stragglingly |
| (adverb) in a ragged uneven manner | Synonyms: unevenly |
| raggedness | (noun) shabbiness by virtue of being in rags | - |
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| (noun) a texture of a surface or edge that is not smooth but is irregular and uneven | Synonyms: roughness |
| ragi | (noun) East Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orient | Synonyms: African millet, coracan, corakan, Eleusine coracana, finger millet, kurakkan, ragee |
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| raging | (adjective) very severe | - |
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| (adjective) (of the elements) as if showing violent anger | Synonyms: angry, furious, tempestuous, wild |
| (adjective) characterized by violent and forceful activity or movement; very intense | Synonyms: hot |
| raglan | (noun) a garment (coat or sweater) that has raglan sleeves | - |
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| ragout | (noun) well-seasoned stew of meat and vegetables | - |
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| ragpicker | (noun) an unskilled person who picks up rags from trash cans and public dumps as a means of livelihood | - |
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| ragsorter | (noun) a worker who sorts rags and old clothing for new uses (as in papermaking) | - |
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| ragtag | (noun) disparaging terms for the common people | Synonyms: rabble, ragtag and bobtail, riffraff |
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| ragtime | (noun) music with a syncopated melody (usually for the piano) | Synonyms: rag |
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| ragweed | (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: ambrosia, bitterweed |
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| (noun) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | Synonyms: benweed, ragwort, Senecio jacobaea, tansy ragwort |
| ragwort | (noun) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | Synonyms: benweed, ragweed, Senecio jacobaea, tansy ragwort |
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| (noun) American ragwort with yellow flowers | Synonyms: butterweed, Senecio glabellus |
| raid | (noun) a sudden short attack | Synonyms: foray, maraud |
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| (noun) an attempt by speculators to defraud investors | - |
| (verb) search for something needed or desired | - |
| (verb) enter someone else's territory and take spoils | Synonyms: foray into |
| (verb) take over (a company) by buying a controlling interest of its stock | - |
| (verb) search without warning, make a sudden surprise attack on | Synonyms: bust |
| raider | (noun) a corporate investor who intends to take over a company by buying a controlling interest in its stock and installing new management | - |
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| (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, looter, pillager, plunderer, spoiler |
| raiding | (adjective) characterized by plundering or pillaging or marauding | Synonyms: marauding, predatory |
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| rail | (noun) any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud | - |
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| (noun) a horizontal bar (usually of wood or metal) | - |
| (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rails, runway, track |
| (noun) a barrier consisting of a horizontal bar and supports | Synonyms: railing |
| (noun) short for railway | - |
| (verb) complain bitterly | Synonyms: inveigh |
| (verb) spread negative information about | Synonyms: revile, vilify, vituperate |
| (verb) criticize severely | Synonyms: fulminate |
| (verb) fish with a handline over the rails of a boat | - |
| (verb) lay with rails | - |
| (verb) travel by rail or train | Synonyms: train |
| (verb) separate with a railing | Synonyms: rail off |
| (verb) convey (goods etc.) by rails | - |
| (verb) provide with rails | - |
| (verb) enclose with rails | Synonyms: rail in |
| railbird | (noun) a fan of racing who watches races from the outer rail of the track | - |
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| railcar | (noun) a wheeled vehicle adapted to the rails of railroad | Synonyms: car, railroad car, railway car |
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| railhead | (noun) a railroad depot in a theater of operations where military supplies are unloaded for distribution | - |
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| (noun) the end of the completed track on an unfinished railway | - |
| railing | (noun) a barrier consisting of a horizontal bar and supports | Synonyms: rail |
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| (noun) material for making rails or rails collectively | - |
| raillery | (noun) light teasing repartee | Synonyms: backchat, banter, give-and-take |
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| railroad | (noun) line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight | Synonyms: railroad line, railway, railway line, railway system |
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| (noun) a line of track providing a runway for wheels | Synonyms: railroad track, railway |
| (verb) transport by railroad | - |
| (verb) supply with railroad lines | - |
| (verb) compel by coercion, threats, or crude means | Synonyms: dragoon, sandbag |
| railroader | (noun) an employee of a railroad | Synonyms: railroad man, railway man, railwayman, trainman |
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| railroading | (noun) the activity of designing and constructing and operating railroads | Synonyms: rail technology |
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| rails | (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rail, runway, track |
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| railway | (noun) line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight | Synonyms: railroad, railroad line, railway line, railway system |
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| (noun) a line of track providing a runway for wheels | Synonyms: railroad, railroad track |
| railwayman | (noun) an employee of a railroad | Synonyms: railroad man, railroader, railway man, trainman |
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| railyard | (noun) an area having a network of railway tracks and sidings for storage and maintenance of cars and engines | Synonyms: railway yard, yard |
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| raiment | (noun) especially fine or decorative clothing | Synonyms: array, regalia |
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| (verb) provide with clothes or put clothes on | Synonyms: apparel, clothe, dress, enclothe, fit out, garb, garment, habilitate, tog |
| raimentless | (adjective) possessing no clothing | Synonyms: clothesless, garmentless |
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| rain | (noun) anything happening rapidly or in quick successive | Synonyms: pelting |
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| (noun) water falling in drops from vapor condensed in the atmosphere | Synonyms: rainfall |
| (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rainwater |
| (verb) precipitate as rain | Synonyms: rain down |
| rainbow | (noun) an illusory hope | - |
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| (noun) an arc of colored light in the sky caused by refraction of the sun's rays by rain | - |
| raincoat | (noun) a water-resistant coat | Synonyms: waterproof |
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| raindrop | (noun) a drop of rain | - |
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| rainfall | (noun) water falling in drops from vapor condensed in the atmosphere | Synonyms: rain |
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| rainfly | (noun) flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent | Synonyms: fly, fly sheet, tent-fly, tent flap |
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| rainforest | (noun) a forest with heavy annual rainfall | Synonyms: rain forest |
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| raininess | (noun) (of weather) the badness of the weather | Synonyms: foulness |
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| raining | (adjective) falling in drops or as if falling like rain | - |
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| rainless | (adjective) lacking rain | - |
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| rainlessness | (noun) The state or condition of being rainless; lack of rain; drought. | - |
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| rainmaker | (noun) American Indian medicine man who attempt to make it rain | - |
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| (noun) executive who is very successful in bringing in business to his company or firm | - |
| rainmaking | (noun) activity intended to produce rain | - |
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| rainproof | (adjective) not permitting the passage of water | Synonyms: waterproof, waterproofed |
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| rainstorm | (noun) a storm with rain | - |
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| rainwater | (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rain |
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| rainy | (adjective) (of weather) wet by periods of rain | Synonyms: showery |
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| raisable | (adjective) capable of being raised | Synonyms: raiseable |
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| raise | (noun) the act of raising something | Synonyms: heave, lift |
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| (noun) increasing the size of a bet (as in poker) | - |
| (noun) the amount a salary is increased | Synonyms: hike, rise, salary increase, wage hike, wage increase |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, rise, upgrade |
| (verb) cause to become alive again | Synonyms: resurrect, upraise |
| (verb) increase the level of | Synonyms: enhance, heighten |
| (verb) raise the level or amount of something | - |
| (verb) raise in rank or condition | Synonyms: elevate, lift |
| (verb) invigorate or heighten | Synonyms: lift |
| (verb) put an end to | Synonyms: lift |
| (verb) bring (a surface or a design) into relief and cause to project | - |
| (verb) multiply (a number) by itself a specified number of times: 8 is 2 raised to the power 3 | - |
| (verb) cause to be heard or known; express or utter | - |
| (verb) put forward for consideration or discussion | Synonyms: bring up |
| (verb) activate or stir up | - |
| (verb) establish radio communications with | - |
| (verb) pronounce (vowels) by bringing the tongue closer to the roof of the mouth | - |
| (verb) cause to assemble or enlist in military | Synonyms: levy, recruit |
| (verb) bet more than the previous player | - |
| (verb) bid (one's partner's suit) at a higher level | - |
| (verb) summon into action or bring into existence, often as if by magic | Synonyms: arouse, bring up, call down, call forth, conjure, conjure up, evoke, invoke, put forward, stir |
| (verb) construct, build, or erect | Synonyms: erect, put up, rear, set up |
| (verb) cultivate by growing, often involving improvements by means of agricultural techniques | Synonyms: farm, grow, produce |
| (verb) create a disturbance, especially by making a great noise | - |
| (verb) call forth (emotions, feelings, and responses) | Synonyms: arouse, elicit, enkindle, evoke, fire, kindle, provoke |
| (verb) raise from a lower to a higher position | Synonyms: bring up, elevate, get up, lift |
| (verb) cause to puff up with a leaven | Synonyms: leaven, prove |
| (verb) move upwards | Synonyms: lift |
| (verb) collect funds for a specific purpose | - |
| (verb) look after a child until it is an adult | Synonyms: bring up, nurture, parent, rear |
| (verb) give a promotion to or assign to a higher position | Synonyms: advance, elevate, kick upstairs, promote, upgrade |
| (verb) register formally as a participant or member | Synonyms: enrol, enroll, enter, inscribe, recruit |