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2295 entries found
radio-carbon (n.)
"Carbon-14," 1940, from radio-, combining form of radioactive, + carbon. Radio-carbon dating is attested from 1949.
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radio-telephone (n.)
1900, from radio (n.) + telephone (n.).
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radioactive (adj.)
1898, from French radio-actif, coined by Pierre and Marie Curie from radio-, combining form of Latin radius (see radiation) + actif "active" (see active).
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radioactivity (n.)
1899, from French radioactivité, coined 1898 by the Curies; see radioactive.
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radiocast (n.)
1924, from radio (n.) + ending from broadcast.
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radiography (n.)
1896, from radiograph (1880), originally a device to measure sunshine; from radio-, combining form of radiation, + -graph. As a type of image-making device, from 1896.
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radioisotope (n.)
1946, from radio-, combining form of radiation, + isotope.
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radiolarian (n.)
1862, from Radiolaria, Modern Latin classification name, from Latin radiolus, diminutive of radius (q.v.).
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radiology (n.)
1900, "medical use of X-rays," later extended to "scientific study of radiation," from radio-, combining form of radiation, + Greek-based scientific suffix -ology. Related: Radiological.
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radiometric (adj.)
1877, from radiometer "instrument to transform radiant energy into mechanical work" (1875), radiometry, from radio-, here indicating "radiant energy," + -metric. Radiometric dating attested from 1906.
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