/ Thesaurus / F Synonyms of fissure of sylvius Find synonyms for: Noun1. fissure of Sylvius, Sylvian fissure, lateral cerebral sulcus, sulcus lateralis cerebri, sulcususage: the deepest and most prominent of the cortical fissures; separates the frontal lobes and temporal lobes in both hemispheresWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language