Definition of propellant noun from the Oxford Advanced American Dictionary

     

    propellant

     noun
    noun
    NAmE//prəˈpɛlənt//
     
    [countable, uncountable]
     
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  1. 1a gas that forces out the contents of an aerosol
  2. 2a thing or substance that propels something, for example the fuel that fires a rocket
See the Oxford Advanced Learner's Dictionary entry: propellant