/ Dictionary / Index R Rio Branco: Meaning and Definition of Find definitions for: Ri•o Bran•co Pronunciation: (rē'oo brän'koo), [key] a city in W Brazil. 119,815. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Riobamba Río Bravo 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