/ Thesaurus / E Synonyms of eustachian tube Find synonyms for: Noun1. Eustachian tube, auditory tube, salpinxusage: either of the paired tubes connecting the middle ears to the nasopharynx; equalizes air pressure on the two sides of the eardrumWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language