induration
noun
                                                                                                                            
                                                            in·du·ra·tion
                    
                                                                                                              
                                                                                                                                  ˌin-də-ˈrā-shən 
                                                                                                                              
            -dyə-
                                                      
                                                          
                                
              
          
                                                      : the process of or condition produced by growing hard                                      
                
                                
            specifically                
          
                                                      : sclerosis especially when associated with inflammation                                      
            
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  Merriam-Webster unabridged




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