Etymology
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buckeye (n.)

also buck-eye, "American horse-chestnut tree," 1763, said to be so called from resemblance of the nut to a stag's eye (see buck (n.1) + eye (n.)). Meaning "native of Ohio" is attested since 1822, from the great number of such trees growing there. Used figuratively in early 20c. of anything cheap or inferior.

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Definitions of buckeye
1
buckeye (n.)
the inedible nutlike seed of the horse chestnut;
Synonyms: horse chestnut / conker
buckeye (n.)
tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds;
Synonyms: horse chestnut / Aesculus hippocastanum
2
Buckeye (n.)
a native or resident of Ohio;
Synonyms: Ohioan
From wordnet.princeton.edu