/ Thesaurus / H Synonyms of hermissenda crassicornis Find synonyms for: Noun1. Hermissenda crassicornis, sea slug, nudibranchusage: a kind of sea slugWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acme Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language