/ Thesaurus / P Synonyms of pia mater Find synonyms for: Noun1. pia mater, meninx, meningesusage: the highly vascular innermost of the 3 meningesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: bibliophile Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language