/ Dictionary / Index M mouse-dun: Meaning and Definition of Find definitions for: mouse-dun Pronunciation: (mous'dun"), [key] — n. a dark brownish-gray color. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mouse deer mouse-ear Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language