buck-eye (n.)youdaoicibaDictYouDict[buck-eye 词源字典]
"American horse chestnut," 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.[buck-eye etymology, buck-eye origin, 英语词源]