/ Thesaurus / T Synonyms of third ventricle Find synonyms for: Noun1. third ventricle, ventricleusage: a narrow ventricle in the midplane below the corpus callosum; communicates with the fourth ventricle via the Sylvian aqueductWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language