/ Dictionary / Index B boom box: Meaning and Definition of Find definitions for: boom' box" Pronunciation: [key] box (def. 20b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. boom-and-bust boomer Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language