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. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language