noun (n)

• a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines(noun.substance)

  Synonym:
  gas, gasolene, petrol
  

  source: wordnet30
• A highly volatile mixture of fluid hydrocarbons, obtained from petroleum, as also by the distillation of bituminous coal. It is used in making air gas, and in giving illuminating power to water gas. See Carburetor.(noun)

  source: webster1913