/ Dictionary / Index M mummer: Meaning and Definition of Find definitions for: mum•mer Pronunciation: (mum'ur), [key] — n. a person who wears a mask or fantastic costume while merrymaking or taking part in a pantomime, esp. at Christmas and other festive seasons. an actor, esp. a pantomimist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mummer (Thesaurus) mumm mummery Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language