/ Dictionary / Index I Iguassú Falls: Meaning and Definition of Find definitions for: I'guassú Falls' Pronunciation: [key] a waterfall on the Iguassú River, on the boundary between Brazil and Argentina. 210 ft. (64 m) high. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Iguassú IGY Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language