/ Dictionary / Index M Mare Nectaris: Meaning and Definition of Find definitions for: Ma•re Nec•ta•ris Pronunciation: (mär'ā nek-tär'is, mâr'ē), [key] (Sea of Nectar) a dark plain in the fourth quadrant of the face of the moon: about 26,000 sq. mi. (67,000 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. maremma Marengo 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