/ Thesaurus / M Synonyms of mytilid Find synonyms for: Noun1. marine mussel, mytilid, musselusage: marine bivalve mollusk having a dark elongated shell; live attached to solid objects especially in intertidal zonesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language