/ Dictionary / Index R Río de la Plata: Meaning and Definition of Find definitions for: Rí•o de la Pla•ta Pronunciation: (Sp. rē'ô e lä plä'tä). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rio de Janeiro Río de Oro 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