1
                    
                                          
              
          
                                                      : a notch or tooth in a joining surface (as of a piece of building material) to prevent slipping                                      
                
                    
2
                    
                                          
              
          
                                                      : a dowel for joining two adjacent blocks of masonry                                      
                
                    
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  Merriam-Webster unabridged




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