Breadcrumb Home > Thesaurus > S Synonyms of sonic Find synonyms for: Adjective 1. sonic (vs. subsonic) (vs. supersonic), transonic usage: (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom" 2. sonic, audible (vs. inaudible), hearable usage: relating to audible sound; "a sonic wave" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sonic (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: antecedent Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language