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/.
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British Dictionary definitions for iguaçú




a river in SE South America, rising in S Brazil and flowing west to join the Paraná River, forming part of the border between Brazil and Argentina. Length: 1200 km (745 miles)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012