buckeye

(bŭkˈīˌ)

1. 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.
2. The spiny or smooth fruit of any of these plants.
3. The large shiny brown seed of such a fruit.