| roe | (noun) eggs of female fish | - |
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| (noun) the eggs or egg-laden ovary of a fish | - |
| (noun) the egg mass or spawn of certain crustaceans such as the lobster | - |
| (noun) fish eggs or egg-filled ovary; having a grainy texture | Synonyms: hard roe |
| roebuck | (noun) male roe deer | - |
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| roentgen | (noun) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air | Synonyms: R |
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| roentgenium | (noun) a radioactive transuranic element, with atomic number 111 | Synonyms: atomic number 111, element 111, Rg |
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| roentgenogram | (noun) a radiogram made by exposing photographic film to X rays; used in medical diagnosis | Synonyms: X-ray, X-ray photograph, X-ray picture, X ray |
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| roentgenographic | (adjective) relating to or produced by roentgenography | - |
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| roentgenography | (noun) radiography that uses X-rays to produce a roentgenogram | Synonyms: X-ray photography |
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| roentgenoscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: fluoroscope |
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