/ Dictionary / Index M mouthpart: Meaning and Definition of Find definitions for: mouth•part Pronunciation: (mouth'pärt"), [key] — n. Usually,the appendages surrounding or associated with the mouth of arthropods. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mouthpart (Thesaurus) mouth organ mouthpiece Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language