tigrolysis
noun
                                                                                                                            
                                                            ti·grol·y·sis
                    
                                                                                                              
                                                                                                                                  tī-ˈgräl-ə-səs 
                                                      
                                                          
            
            
               plural tigrolyses
                                        -ˌsēz 
    
            
        
    
                                
              
          
                                                      : loss of Nissl bodies or Nissl substance that accompanies degenerative changes in nerve tissue                                      
                
                    
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  Merriam-Webster unabridged




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