erasion
noun
                                                                                                                            
                                                            era·sion
                    
                                                                                                              
                                                                                                                                  i-ˈrā-zhən, -shən  
                                                      
                                                          
            
                                
              
          
                                                      : surgical removal of diseased tissue by scraping or curetting                                      
                
                    
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  Merriam-Webster unabridged




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