/ Thesaurus / E Synonyms of external gill Find synonyms for: Noun1. external gill, gill, branchiausage: occurs in some mollusks and in tadpoles and other immature amphibiansWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: kiln Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language