/ Dictionary / Index R Río Cuarto: Meaning and Definition of Find definitions for: Rí•o Cuar•to Pronunciation: (rē'ô kwär'tô), [key] a city in central Argentina. 110,148. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Río Bravo Río da Duvida 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