Definition of chestnut adjective from the Oxford Advanced Learner's Dictionary

 

chestnut

 adjective
adjective
BrE BrE//ˈtʃesnʌt//
 
; NAmE NAmE//ˈtʃesnʌt//
 
 
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reddish-brown in colour Word Origin early 16th cent.: from Old English chesten (from Old French chastaine, via Latin from Greek kastanea) + nut.
See the Oxford Advanced American Dictionary entry: chestnut