Definitions for "Rio Grande"
a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico
(Spanish) The river running through the southwestern United States and along the border of the modern nations of Mexico and the U.S. The river originates in the San Juan Mountains of Colorado and spills into the Gulf of Mexico at Brownsville, Texas. It was the backbone of much indigenous agriculture and settlement in northern Spanish America, particularly among Pueblos.
the river that borders Texas on the southwest.