/ Dictionary / Index M muss: Meaning and Definition of Find definitions for: muss Pronunciation: (mus), [key] — n. a state of disorder or untidiness. —v.t. to put into disorder; make messy; rumple (often fol. by up). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: muss (Thesaurus) musquash root mussaka Related Content Daily Word Quiz: industrious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language