1 a state of the central U.S., 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.: 11186331 (1997 est.). Area: 107044 sq. km (41330 sq. miles), (Abbrev. and zip code)
2 a river in the eastern U.S., 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)
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