/ Dictionary / Index M mareograph: Meaning and Definition of Find definitions for: mar•e•o•graph Pronunciation: (mar'ē-u-graf", -gräf"), [key] — n. Oceanog. marigraph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mare Nubium Mare Serenitatis Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language