Definition of buckwheat noun from the Oxford Advanced Learner's Dictionary

 

buckwheat

 noun
noun
BrE BrE//ˈbʌkwiːt//
 
; NAmE NAmE//ˈbʌkwiːt//
 
[uncountable] Carbohydrates, Crops
 
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small dark seed that is grown as food for animals and for making flour See related entries: Carbohydrates, Crops Word Origin mid 16th cent.: from Middle Dutch boecweite ‘beech wheat’, its grains being shaped like beechmast.
See the Oxford Advanced American Dictionary entry: buckwheat