/ Dictionary / Index S sound truck: Meaning and Definition of Find definitions for: sound' truck" Pronunciation: [key] a truck carrying a loudspeaker from which speeches, music, etc., are broadcast, as for advertising, campaigning, or the like. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. soundtrack sound wave Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language