| adios | (noun) a farewell remark | Synonyms: adieu, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| estradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: oestradiol |
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| gladiola | (noun) any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated | Synonyms: glad, gladiolus, sword lily |
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| gladiolus | (noun) the large central part of the breastbone | Synonyms: corpus sternum |
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| (noun) any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated | Synonyms: glad, gladiola, sword lily |
| menadione | (noun) a synthetic chemical compound that is a form of vitamin K, it is an analog of 1,4-naphthoquinone with a methyl group in the 2-position | Synonyms: vitamin K3 |
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| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| phytonadione | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phylloquinone, vitamin K1 |
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| radio | (noun) a communication system based on broadcasting electromagnetic waves | Synonyms: wireless |
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| (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio receiver, radio set, receiving set, tuner, wireless |
| (noun) medium for communication | Synonyms: radiocommunication, wireless |
| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| radiocarbon | (noun) a radioactive isotope of carbon | Synonyms: carbon 14 |
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| radiochemist | (noun) a chemist who specializes in nuclear chemistry | Synonyms: nuclear chemist |
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| radiochemistry | (noun) the chemistry of radioactive substances | Synonyms: nuclear chemistry |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| 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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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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