/ Dictionary / Index R Río Gallegos: Meaning and Definition of Find definitions for: Rí•o Ga•lle•gos Pronunciation: (rē'ô gä-ye'gôs), [key] a seaport in S Argentina, in S Patagonia. 43,479. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Río de Oro Rio Grande Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language