/ Thesaurus / C Synonyms of chorioallantoic membrane Find synonyms for: Noun1. chorioallantois, chorioallantoic membrane, membrane, tissue layerusage: the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantoisWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: deity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language