a state of the central US, in the Midwest on Lake Erie: consists of prairies in the W and the Allegheny plateau in the E, the Ohio River forming the S and most of the E borders. Capital: Columbus. Pop: 11 435 798 (2003 est). Area: 107 044 sq km (41 330 sq miles) Abbreviation and zip code OH
a river in the eastern US, formed by the confluence of the Allegheny and Monongahela Rivers at Pittsburgh: flows generally W and SW to join the Mississippi at Cairo, Illinois, as its chief E tributary. Length: 1570 km (975 miles)
originally used of the river, from Seneca (Iroquoian) ohi:yo', proper name from ohi:yo:h, lit. "good river." The Seneca also used this of the Allegheny, which they considered the headwaters of the Ohio.