/ Dictionary / Index M mule deer: Meaning and Definition of Find definitions for: mule' deer" Pronunciation: [key] a deer, Odocoileus hemionus, of western North America, having large ears and a gray coat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mule chest mule-ears Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language