/ Thesaurus / S Synonyms of serous membrane Find synonyms for: Noun1. serous membrane, serosa, membrane, tissue layerusage: a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluidWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language