variants  
 or less commonly asphaltum    
    
                                                        as-ˈfȯl-təm  
                                                    
         especially British  -ˈfal-
            1
                    
                                          
              
          
                                                      : a dark bituminous substance that is found in natural beds and is also obtained as a residue in petroleum refining and that consists chiefly of hydrocarbons                                      
                
                    
2
                    
                                          
              
          
                                                      : an asphaltic composition used for pavements and as a waterproof cement                                      
                
                    
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  Merriam-Webster unabridged




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