/ Dictionary / Index S sonic boom: Meaning and Definition of Find definitions for: son'ic boom' Pronunciation: [key] a loud noise caused by the shock wave generated by an aircraft moving at supersonic speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sonic barrier sonic depth finder Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language