| 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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| sporadic | (adjective) recurring in scattered and irregular or unpredictable instances | - |
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| sporadically | (adverb) in a sporadic manner | Synonyms: periodically |
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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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| 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 |
| 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 |
| 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 |
| traditional | (adjective) consisting of or derived from tradition | - |
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| (adjective) pertaining to time-honored orthodox doctrines | - |
| 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 | (adjective) stubbornly conservative and narrow-minded | Synonyms: hidebound |
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| (noun) one who adheres to traditional views | Synonyms: diehard |
| traditionalistic | (adjective) adhering to tradition especially in cultural or religious practices | - |
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| traditionality | (noun) strict adherence to traditional methods or teachings | Synonyms: traditionalism |
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| traditionally | (adverb) according to tradition; in a traditional manner | - |
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| untraditional | (adjective) not conforming to or in accord with tradition | Synonyms: nontraditional |
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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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