/ Thesaurus / M Synonyms of moon shell Find synonyms for: Noun1. moon shell, moonshell, seasnailusage: marine gastropods having smooth rounded shells that form short spiresWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language