catastrophe
noun
                                                                                                                            
                                                            ca·tas·tro·phe
                    
                                                                                                              
                                                                                                                                  kə-ˈta-strə-(ˌ)fē  
                                                      
                                                          
            
            
               plural catastrophes            
        
    1
                    
                                          
              
          
                                                      : a momentous tragic event ranging from extreme misfortune to utter overthrow or ruin                                      
              
                             
Deforestation and erosion can lead to an ecological catastrophe.
                         
                
                    2
                    
                                          
              
          
                                                      : utter failure : fiasco                                      
              
                             
the party was a catastrophe
                         
                
                    3
                    
        a
    
          
                                          
              
          
                                                      : a violent and sudden change in a feature of the earth                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a violent usually destructive natural event (such as a supernova)                                      
                
                    
4
                    
                                          
              
          
                                                      : the final event of the dramatic action especially of a tragedy                                      
                
                    
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  Merriam-Webster unabridged




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