1
                    
                                ninepins  plural in form but singular in construction                                  
              
          
                                                      : a bowling game resembling tenpins played without the headpin or having the nine pins in a diamond-shaped configuration with one pin in the center                                      
                
                    
2
                    
                                          
              
          
                                                      : a pin used in ninepins                                      
                
                    
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  Merriam-Webster unabridged




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