The Collaborative International Dictionary
Buckeye \Buck"eye`\ (b[u^]k"[imac]`), n.
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(Bot.) A name given to several American trees and shrubs of the same genus ( [AE]sculus) as the horse chestnut.
The Ohio buckeye, or Fetid buckeye, is Aesculus glabra.
Red buckeye is Aesculus Pavia.
Small buckeye is Aesculus paviflora.
Sweet buckeye, or Yellow buckeye, is Aesculus flava.
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A cant name for a native or resident of Ohio. [U.S.]
Buckeye State, Ohio; -- so called because buckeye trees abound there.
Wikipedia
Aesculus flava, the yellow buckeye, common buckeye, or sweet buckeye, is a species of deciduous tree. It is native to the Ohio Valley and Appalachian Mountains of the Eastern United States. It grows in mesophytic forest or floodplains, generally in acid to circumneutral soil, reaching a height of 20m to 47m.
The leaves are palmately compound with five (rarely seven) leaflets, 10–25 cm long and broad. The flowers are produced in panicles in spring, yellow to yellow-green, each flower 2–3 cm long with the stamens shorter than the petals (unlike the related A. glabra (Ohio buckeye), where the stamens are longer than the petals). The twigs have a faintly rank odor, but much less so than the Ohio buckeye, A. glabra. The fruit is a smooth (spineless), round or oblong capsule 5–7 cm diameter, containing 1-3 nut-like seeds, 2.5-3.5 cm diameter, brown with a whitish basal scar. The fruit is poisonous to humans but can be made edible through a leaching process.