Pronunciation: (är'kun-sô"; also for 2 ar-kan'zus),[key] —n. 1. state in S central United States; 2,285,513. 53,103 sq. mi. (137,537 sq. km). Cap.: Little Rock. Abbr.: AR (for use with zip code), Ark.
2. a river flowing E and SE from central Colorado into the Mississippi in SE Arkansas. 1450 mi. (2335 km) long.