/ Dictionary / Index R Río de Oro: Meaning and Definition of Find definitions for: Rí•o de O•ro Pronunciation: (rē'ô e ô'rô), [key] Western Sahara. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Río de la Plata Río Gallegos Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language