/ Dictionary / Index M mare: Meaning and Definition of Find definitions for: mare Pronunciation: (mâr), [key] — n. a fully mature female horse or other equine animal. mare Pronunciation: (mâr), [key] — n. Obs. nightmare (def. 3). ma•re Pronunciation: (mär'ā, mâr'ē), [key] — pl. ma•ri•a any of the several large, dark plains on the moon and Mars: Galileo believed that the lunar features were seas when he first saw them through a telescope. Mar.E. Pronunciation: [key] Marine Engineer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mare (Thesaurus) Marduk Mare Acidalium Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language