asbestos
noun
                                                                                                                            
                                                            as·bes·tos
                    
                                                                                                              
                                                                                                                                  as-ˈbe-stəs  
                                                                                                                              
            az-
                                                      
                                                          
                                
              
          
                                                      : any of several minerals (such as chrysotile) that readily separate into long flexible fibers, that cause asbestosis and have been implicated as causes of certain cancers, and that have been used especially formerly as fireproof insulating materials                                      
                
                    
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