Added 9 October 2026 ohio noun Categories: PlacesNatureEveryday Words noun ! Definition from WordNet 3.1, Princeton University. More about ohio at Wordnik → Where our words come from → A midwestern state in north central United States in the Great Lakes region. A river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River. Related Words: uruguaymerrillsealyindianamichiganiowacolumbustexaszanesvillechillicothe Back to today's word