/ Thesaurus / F Synonyms of fissurella apertura Find synonyms for: Noun1. keyhole limpet, Fissurella apertura, Diodora apertura, limpetusage: marine limpet having a conical shell with an opening at the apexWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language