/ Dictionary / Index S sonic: Meaning and Definition of Find definitions for: son•ic Pronunciation: (son'ik), [key] — adj. of or pertaining to sound. noting or pertaining to a speed equal to that of sound in air at the same height above sea level. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sonic (Thesaurus) Sonia sonic barrier Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language