/ Dictionary / Index M mus.: Meaning and Definition of Find definitions for: mus. Pronunciation: [key] museum. music. musical. musician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mus (Thesaurus) murther musaceous Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language