/ Dictionary / Index M mountain sheep: Meaning and Definition of Find definitions for: moun'tain sheep" Pronunciation: [key] the bighorn. any of various wild sheep inhabiting mountains. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mountain sandwort mountain sickness Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language