Definition of fuel noun from the Oxford Advanced American Dictionary

      

    fuel

     noun
    noun
    NAmE//ˈfyuəl//
     
    , NAmE//fyul//
     
     
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  1. 1 [uncountable, countable] any material that produces heat or power, usually when it is burned solid fuel (= wood, coal, etc.) nuclear fuels a car with high fuel consumption Fuel bills for home heating are set to rise again in the fall. see also fossil fuel
  2. 2[uncountable] a thing that is said or done that makes something, especially an argument, continue or get worse The new information adds fuel to the debate over safety procedures. The revelations gave new fuel to angry opponents of the proposed law. His remarks simply added fuel to the fire/flames of her rage.
See the Oxford Advanced Learner's Dictionary entry: fuel