n. An American name for the different species of horse-chestnut, Æsculus, native to the United States.n. An inhabitant of Ohio, which is often called the Buckeye State, from the great number of horse-chestnuts in it.n. A flat-bottomed centerboard schooner of small size (3 to 15 tons), decked over, and with a cabin aft, used in oyster-fishing in Chesapeake Bay. Also called bugeye.n. In entomology, an American nymphalid butterfly, Junonia cœnia.