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2295 entries found
radioscopy (n.)
1896, from radio- + -scopy.
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radiotherapy (n.)
1903, from radio- + therapy.
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radish (n.)

late Old English rædic "radish," from Latin radicem (nominative radix) "root, radish," from PIE root *wrād- "branch, root." Spelling perhaps influenced by Old French radise, variant of radice, from Vulgar Latin *radicina, from radicem.

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radium (n.)
radioactive metallic element, 1899, from French radium, named 1898 after identification by Marie Curie and her husband, formed in Modern Latin from Latin radius "ray" (see radius). With metallic element ending -ium. So called for its power of emitting energy in the form of rays.
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radius (n.)
1590s, "cross-shaft," from Latin radius "staff, stake, rod; spoke of a wheel; ray of light, beam of light; radius of a circle," of unknown origin. Perhaps related to radix "root," but de Vaan finds that "unlikely."

The geometric sense first recorded 1610s. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1610s in English (the Latin word had been used thus by the Romans).
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Radnor 
place in eastern Wales, the name is Old English, literally "at the red bank," from Old English read (dative singular readan; from PIE root *reudh- "red, ruddy") + ofer "bank, slope."
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radon (n.)
heaviest gaseous element, 1918, from German Radon, from radium (q.v.) + -on suffix of inert gases. The element was identified in radioactive decay of radium. Alternative name niton (from Latin nitens "shining") gained currency in France and Germany.
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radula (n.)
surgical instrument, 1753, from Latin radula "scraper, scraping iron," from radere "to scrape," possibly from an extended form of PIE root *red- "to scrape, scratch, gnaw." Related: Radular.
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raffia (n.)
fiber-yielding tree of Madagascar, 1729, rofia, from Malagasy rafia. Modern form is attested from 1882; also raphia (1866).
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raffish (adj.)
"disreputable, vulgar," 1795, from raff "people," usually of a lower sort (1670s), probably from rif and raf (mid-14c.) "everyone," from Middle English raf, raffe "one and all, everybody" (see riffraff). Related: Raffishly; raffishness.
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