cumulo-nimbus cumulonimbus • cumulonimbus cloud · · · Info · Definitions · Synonyms · Characters · · cumulo-nimbus · · Text Common · · Latin · · Scripts 13 · · Length 5 · · Syllables Definitions · · · (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms. Synonyms: cumulonimbus, cumulonimbus cloud, thundercloud. · · Noun Definition 1 Synonyms · · · cumulonimbus · · Synonym 1 cumulonimbus cloud · · Synonym 2 thundercloud · · Synonym 3 Characters · · - hyphen-minus U+002D b latin small letter b U+0062 c latin small letter c U+0063 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075