/ Dictionary / Index M mare nostrum*: Meaning and Definition of Find definitions for: ma•re nos•trum Pronunciation: (mä're nōs'troom Eng. mâr'ē nos'tr&schwam, mär'ā), [key] — Latin. Latin. our sea, esp. the Mediterranean to the ancient Romans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marengo Mare Nubium 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