lignify
verb
                                                                                                                            
                                                            lig·ni·fy
                    
                                                                                                              
                                                                                                                                  ˈlig-nə-ˌfī  
                                                      
                                                          
            
            
              lignified; lignifying            
        
    
                                
              
          
                                                      : to convert into wood or woody tissue                                      
                
                    
                                
              
          
                                                      : to become wood or woody                                      
                
                    
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  Merriam-Webster unabridged




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