/ Thesaurus / S Synonyms of sigmoid sinus Find synonyms for: Noun1. sigmoid sinus, sinus sigmoideus, venous sinus, sinususage: an S-shaped dural sinus on the temporal and occipital bonesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language