hyperinvolution
noun
                                                                                                                            
                                                            hy·per·in·vo·lu·tion
                    
                                                                                                              
                                                                                                                                  ˌhī-pər-ˌin-və-ˈlü-shən 
                                                      
                                                          
            
            
               plural hyperinvolutions            
        
    
        medical      
      
                                
                                
              
          
                                                      : unusually rapid return to normal or less than normal size of an organ (such as the uterus) following enlargement                                      
                
                    
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  Merriam-Webster unabridged




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