| radiocommunication | (noun) medium for communication | Synonyms: radio, wireless |
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| radiogram | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiograph, shadowgraph, skiagram, skiagraph |
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| (noun) a message transmitted by wireless telegraphy | - |
| radiograph | (noun) a photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) | Synonyms: radiogram, shadowgraph, skiagram, skiagraph |
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| radiographer | (noun) a person who makes radiographs | - |
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| radiography | (noun) photography that uses other kinds of radiation than visible light | - |
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| (noun) the process of making a radiograph; producing an image on a radiosensitive surface by radiation other than visible light | Synonyms: skiagraphy |
| radioimmunoassay | (noun) immunoassay of a substance that has been radioactively labeled | - |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| radiolocation | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radar, radio detection and ranging |
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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 | - |
| 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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| 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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| 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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| 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 |
| 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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| sporadicalness | (noun) The quality of being rare and scattered in occurrence. | - |
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| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| straddle | (noun) the act of sitting or standing astride | Synonyms: span |
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| (noun) the option to buy or sell a given stock (or stock index or commodity future) at a given price before a given date; consists of an equal number of put and call options | - |
| (noun) a gymnastic exercise performed with a leg on either side of the parallel bars | - |
| (noun) a noncommittal or equivocal position | - |
| taradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, tarradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, tarradiddle, tommyrot, tosh, twaddle |
| tardigrade | (noun) an arthropod of the division Tardigrada | - |
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| tarradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, taradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tommyrot, tosh, twaddle |
| tetrad | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity |
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| tirade | (noun) a speech of violent denunciation | Synonyms: broadside, philippic |
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| trad | (noun) traditional jazz as revived in the 1950s | - |
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| trade | (noun) the skilled practice of a practical occupation | Synonyms: craft |
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| (noun) the business given to a commercial establishment by its customers | Synonyms: patronage |
| (noun) a particular instance of buying or selling | Synonyms: business deal, deal |
| (noun) an equal exchange | Synonyms: barter, swap, swop |
| (noun) the commercial exchange (buying and selling on domestic or international markets) of goods and services | - |
| (noun) people who perform a particular kind of skilled work | Synonyms: craft |
| (noun) steady winds blowing from east to west above and below the equator | Synonyms: trade wind |
| tradecraft | (noun) skill acquired through experience in a trade; often used to discuss skill in espionage | - |
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| trademark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, hallmark, stylemark |
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| (noun) a formally registered symbol identifying the manufacturer or distributor of a product | - |
| tradeoff | (noun) an exchange that occurs as a compromise | Synonyms: trade-off |
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| trader | (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: bargainer, dealer, monger |
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| tradesman | (noun) a merchant who owns or manages a shop | Synonyms: market keeper, shopkeeper, storekeeper |
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| tradespeople | (noun) people engaged in trade | - |
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| trading | (noun) buying or selling securities or commodities | - |
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| tradition | (noun) an inherited pattern of thought or action | - |
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| (noun) a specific practice of long standing | Synonyms: custom |
| traditionalism | (noun) adherence to tradition (especially in cultural or religious matters) | - |
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| (noun) strict adherence to traditional methods or teachings | Synonyms: traditionality |
| (noun) the doctrine that all knowledge was originally derived by divine revelation and that it is transmitted by traditions | - |
| traditionalist | (noun) one who adheres to traditional views | Synonyms: diehard |
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| traditionality | (noun) strict adherence to traditional methods or teachings | Synonyms: traditionalism |
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| traducement | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, obloquy |
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| traducer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, maligner, slanderer, vilifier |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| undergraduate | (noun) a university student who has not yet received a first degree | Synonyms: undergrad |
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| upgrade | (noun) the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components) | - |
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| (noun) hardware that provides better performance than an earlier version did | - |
| (noun) the property possessed by a slope or surface that rises | Synonyms: rise, rising slope |
| (noun) a reservation that is improved | - |
| (noun) software that provides better performance than an earlier version did | - |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, raise, rise |
| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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