A tree of the horse chestnut family with distinctive nuts, or a person from Ohio (the Buckeye State). The nuts have a glossy brown appearance with a lighter patch resembling a deer's eye.
American English compound of 'buck' (male deer) and 'eye', describing the appearance of the nut which resembles a deer's eye. The name was applied to Ohio residents in the early 19th century, eventually becoming the state's nickname.
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