buckwheat
noun
                                                                                                                            
                                                            buck·wheat
                    
                                                                                                              
                                                                                                                                  ˈbək-ˌ(h)wēt  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : any of a genus (Fagopyrum of the family Polygonaceae, the buckwheat family) of Eurasian herbs with alternate leaves, clusters of apetalous pinkish-white flowers, and triangular seeds                                      
                
                                
            especially                
          
                                                      : either of two plants (F. esculentum and F. tartaricum) cultivated for their edible seeds                                      
            
            2
                    
                                          
              
          
                                                      : the seed of a buckwheat used as a cereal grain                                      
                
                    
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  Merriam-Webster unabridged




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