valvulotome
noun
                                                                                                                            
                                                            val·vu·lo·tome
                    
                                                                                                              
                                                                                                                                  ˈval-vyə-lō-ˌtōm  
                                                      
                                                          
            
                                
              
          
                                                      : a surgical blade designed for valvulotomy or commissurotomy                                      
                
                    
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  Merriam-Webster unabridged




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