/ Dictionary / Index C Chaco: Meaning and Definition of Find definitions for: Cha•co Pronunciation: (chä'kô), [key] — n. a part of the Gran Chaco region in central South America, in Bolivia, Paraguay, and Argentina. ab. 100,000 sq. mi. (259,000 sq. km). See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chacma chaconne Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language