buckeye

(noun) the inedible nutlike seed of the horse chestnut. Synonyms: horse chestnut, conker.

(noun) tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds. Synonyms: horse chestnut, Aesculus hippocastanum.

(noun) a native or resident of Ohio. Synonyms: Ohioan, Buckeye.