/ Thesaurus / S Synonyms of synovium Find synonyms for: Noun1. synovial membrane, synovium, membrane, tissue layerusage: a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluidWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: torrid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language