/ Thesaurus / M Synonyms of mollusc Find synonyms for: Noun1. mollusk, mollusc, shellfish, invertebrateusage: invertebrate having a soft unsegmented body usually enclosed in a shellWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language