a state of NE Brazil, on the Atlantic: rises to a semiarid plateau, with the more humid Paranaíba valley in the west. Capital: Teresina. Pop: 2 898 223 (2002). Area: 250 934 sq km (96 886 sq miles)
Piauí in American English
(pjaʊˈi)
state of NE Brazil: 97,444 sq mi (252,379 sq km); pop. 2,582,000; cap. Teresina