/ Dictionary / Index M mouth harp: Meaning and Definition of Find definitions for: mouth' harp" Pronunciation: [key] harmonica (def. 1). Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mouthful mouth organ Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language