Merriam-Webster Collegiate Dictionary - rio grande

 geographical name  1. (or Mexican Spanish Rio Bravo) river 1885 miles (3034 kilometers) SW United States forming part of Mexico-U.S. boundary & flowing from San Juan Mountains in SW Colorado to Gulf of Mexico  2. (or ~ do Sul) city S Brazil in ~ do Sul state W of entrance to Lagoa dos Patos population 172,435  3. municipality NE Puerto Rico population 52,362  4. — see grande (Rio)