/ Dictionary / Index M Mare Erythraeum: Meaning and Definition of Find definitions for: Ma're Er•y•thrae'um Pronunciation: (er"i-thrē'um), [key] (Red Sea) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mare Crisium Mare Fecunditatis Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language