buckeye
Concise Oxford English Dictionary © 2008 Oxford University Press:
buckeye/ˈbʌkʌɪ/
▶noun
- 1 an American tree or shrub related to the horse chestnut. [Genus Aesculus: several species.]
■ the shiny brown nut of the buckeye.
- 2 an orange and brown New World butterfly with conspicuous eyespots on the wings. [Junonia coenia.]
- 3 (Buckeye) US informal a native of the state of Ohio.
'buckeye' also found in these Oxford entries:

