/ Thesaurus / C Synonyms of cavernous sinus Find synonyms for: Noun1. cavernous sinus, sinus cavernosus, venous sinus, sinususage: either of a pair of large venous sinuses in the cranial cavityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language