- a river in S Brazil, flowing W to the Paraná River. 380 miles (610 km) long.
- a river in S Brazil, flowing W to the Paraná River on the Argentina-Paraguay-Brazil border: noted for its falls. 745 miles (1199 km) long.
Also I·gua·çú [ee-gwuh-soo] /ˌi gwəˈsu/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018