/ Dictionary / Index M moustache: Meaning and Definition of Find definitions for: mous•tache Pronunciation: (mus'tash, mu-stash'), [key] — n. mustache. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: moustache (Thesaurus) Moussorgsky moustache cup Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language