any of various trees (genus Aesculus) of the horse-chestnut family with large capsules enclosing shiny brown seeds
Informal a person born or living in Ohio, called the
buck + eye: from the appearance of the seed
See buckeye in American Heritage Dictionary 4
Any of various North American trees or shrubs of the genus Aesculus, having palmately compound, opposite leaves, erect panicles of white to red or yellow flowers, and large shiny seeds with a large attachment scar. All parts of the plant are poisonous.