/ Dictionary / Index M mumm: Meaning and Definition of Find definitions for: mumm Pronunciation: (mum), [key] — v.i. mum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mu&hamza;min mummer Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language