synfuel
noun
                                                                                                                            
                                                            syn·fu·el
                    
                                                                                                              
                                                                                                                                  ˈsin-ˌfyü(-ə)l  
                                                      
                                                          
            
                                
              
          
                                                      : a liquid or gaseous fuel derived especially from a fossil fuel that is a solid (such as coal) or part of a solid (such as tar sand or oil shale)                                      
                
                    
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  Merriam-Webster unabridged




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