cu·mu·lo·nim·bus (ky m y -l -n m bs)n. pl. cu·mu·lo·nim·bus·es or cu·mu·lo·nim·bi (-b  ) An extremely dense, vertically developed cumulus with a relatively hazy outline and a glaciated top extending to great heights, usually producing heavy rains, thunderstorms, or hailstorms. |
| cumulonimbus (kymy-l-nmbs) Plural cumulonimbi (ky my-l-nmb) An extremely dense, vertically developed cloud with a low, dark base and fluffy masses that tower to great heights. Cumulonimbus clouds usually produce heavy rains, thunderstorms, or hailstorms. Also called thundercloud. See illustration at cloud. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  cumulonimbus - a dark cloud of great vertical extent charged with electricity; associated with thunderstormscloud - a visible mass of water or ice particles suspended at a considerable altitude |
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