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: OHa 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)
WordReference Random House Unabridged Dictionary of American English © 2026
O•hi•o
(ō hī′ō),USA pronunciation n.
- Place Namesa state in the NE central United States: a part of the Midwest. 10,797,419;
41,222 sq. mi. (106,765 sq. km). Cap.: Columbus. Abbr.: OH (for use with zip code), O. - Place Namesa river formed by the confluence of the Allegheny and Monongahela rivers, flowing SW from Pittsburgh, Pa., to the Mississippi in S Illinois. 981 mi. (1580 km) long.
Collins Concise English Dictionary © HarperCollins Publishers::
'Ohio' also found in these entries (note: many are not synonyms or translations):
Akron
- Allegheny
- Amherst
- Amish
- Anderson
- Anti-Saloon League of America
- Ashland
- Ashtabula
- Athens
- Avon Lake
- Barberton
- Bay Village
- Beavercreek
- Bedford
- Bedford Heights
- Bellefontaine
- Berea
- Bexley
- Brecksville
- Broadview Heights
- Brook Park
- Brooklyn
- Brunswick
- Buckeye State
- Bucyrus
- Cambridge
- Campbell
- Canton
- Centerville
- Cheviot
- Chillicothe
- Cincinnati
- Circleville
- Cleveland
- Cleveland Heights
- Columbus
- Conneaut
- Coshocton
- Covington
- Coxey
- Evansville
- Kentucky
- Louisville
- Midwest
- Monongahela
- North
- OH
- Old Northwest
- Parma
- Pittsburgh