Webster's English Dictionary

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buckwheat

buck.wheat \'b*k-.(h)we-t\ n [D boekweit, fr. boec- (akin to OHG buohha 
   beech tree) + w]eit wheat - more at BEECH 1: any of a genus (Fagopyrum of 
   the family Polygonaceae, the buckwhea t family) of herbs with alternate 
   leaves and clusters of apetalous flowers; esp : either of two plants (F. 
   esculeutum and F. tartaricum) long cultivated for their edible seeds 2: the 
   triangular seed of a buckwheat used as a cereal grain