barleycorn
noun
                                                                                                                            
                                                            bar·ley·corn
                    
                                                                                                              
                                                                                                                                  ˈbär-lē-ˌkȯrn 
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : a grain of barley                                      
                
                    
2
                    
                                          
              
          
                                                      : an old unit of length equal to a third of an inch                                      
                
                    
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  Merriam-Webster unabridged




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