cavernous sinus cavernously • cavern out · · · Info · Definitions · Synonyms · Characters · · cavernous sinus · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) either of a pair of large venous sinuses in the cranial cavity. Synonyms: cavernous sinus, sinus cavernosus. · · Noun Definition 1 Synonyms · · · sinus cavernosus · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075 v latin small letter v U+0076