/ Thesaurus / S Synonyms of sonic depth finder Find synonyms for: Noun1. sonic depth finder, fathometer, depth finderusage: depth finder for determining depth of water or a submerged object by means of ultrasound wavesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language