/ Dictionary / Index I Iguassú: Meaning and Definition of Find definitions for: I•guas•sú Pronunciation: (ē"gwä-s'), [key] — n. a river in S Brazil, flowing W to the Paraná River. 380 mi. (610 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: iguassu (Thesaurus) iguanodon Iguassú Falls Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language