1. (noun)gasoline, gasolene, gas, petrol a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines Synonyms: gun, gas pedal, acceleratorpedal, petrol, gaseous state, throttle, gas, gasoline, flatulency, accelerator, flatulence, natural gas, gasolene