/ Dictionary / Index M Madre de Dios: Meaning and Definition of Find definitions for: Ma•dre de Dios Pronunciation: (mä're e dyôs'), [key] a river in Peru and Bolivia, flowing E to the Beni River. 900 mi. (1450 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. madre* madrepore Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language