| Noun | 1. | Araguaya River - a river in central Brazil that flows generally northward (with many falls) to join the Tocantins RiverBrasil, Brazil, Federative Republic of Brazil - the largest Latin American country and the largest Portuguese speaking country in the world; located in the central and northeastern part of South America; world's leading coffee exporter river - a large natural stream of water (larger than a creek); "the river was navigable for 50 miles" | |