firedamp
noun
                                                                                                                            
                                                            fire·damp
                    
                                                                                                              
                                                                                                                                  ˈfī(-ə)r-ˌdamp  
                                                      
                                                          
            
                                
              
          
                                                      : a combustible mine gas that consists chiefly of methane                                      
                
                                
            also                
          
                                                      : the explosive mixture of this gas with air                                      
            
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  Merriam-Webster unabridged




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