/ Dictionary / Index G Guiana: Meaning and Definition of Find definitions for: Gui•an•a Pronunciation: (gē-an'u, -ä'nu, gī-an'u), [key] — n. a vast tropical region in NE South America, bounded by the Orinoco, Negro, and Amazon rivers and the Atlantic. ab. 690,000 sq. mi. (1,787,000 sq. km). the coastal portion of this region, which includes Guyana, French Guiana, and Suriname. 1,263,200; 175,275 sq. mi. (453,962 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: guiana (Thesaurus) GUI Guiana current Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language