Pronunciation: (buk'ī"),[key] —n., —pl.-eyes. 1. any of various trees or shrubs of the genus Aesculus, as A. glabra(Ohio buckeye), having palmate leaves, gray, scaly bark, and bell-shaped greenish-yellow flowers in upright clusters: the state tree of Ohio.
2. the brown nut of any of these trees.
3. (cap.) a native or inhabitant of Ohio (used as a nickname).
4. a butterfly, Precis lavinia, having dark-brown wings with purple or red eyespots.