• (Ireland, colloquial) comical, zany.

    "It was gas when the bird flew into the classroom."

  • "Mary's new boyfriend is a gas man."


  • (countable, chemistry) A chemical element or compound in such a state.

    "The atmosphere is made up of a number of different gases."

  • (US) Methane or other waste gases trapped in one's belly as a result of the digestive process.

    "My tummy hurts so bad, I have gas."

  • (US) Gas pedal.
  • (uncountable, chemistry) Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.

    "A lot of gas had escaped from the cylinder."

  • (countable) A hob on a gas cooker.

    "She turned the gas on, put the potatoes on, then lit the oven."

  • (baseball) A fastball.

    "The closer threw him nothing but gas."

  • (uncountable, US) Gasoline; a derivative of petroleum used as fuel.
  • (uncountable) A flammable gaseous hydrocarbon or hydrocarbon mixture (typically predominantly methane) used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles.

    "Gas-fired power stations have largely replaced coal-burning ones."

  • (slang) A humorous or entertaining event or person.

    "He is such a gas!"


  • (transitive) To singe, as in a gas flame, so as to remove loose fibers.

    "to gas thread"

  • (US) To give a vehicle more fuel in order to accelerate it.

    "The cops are coming. Gas it!"

  • (transitive) To kill with poisonous gas.
  • (transitive) To impregnate with gas.

    "to gas lime with chlorine in the manufacture of bleaching powder"

  • (intransitive) To emit gas.

    "The battery cell was gassing."

  • (US) To fill (a vehicle's fuel tank) with fuel.
  • (intransitive) To talk, chat.

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