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gas

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noun British English pronunciation: gas /ɡæs/ 
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singulargas
pluralgasses
 
  1. 1
    [countable/uncountable] science a substance such as air that is neither a solid nor a liquid

    regulations to cut the emissions of gases such as carbon dioxide

    They detected high levels of radon gas in the building.

    1. a.
      [uncountable] a gas burned as fuel, for example to heat your house or cook food

      a gas cooker/heater/boiler

      She couldn't pay her gas bill.

      Can you smell gas?

      gas mark 3/4 etc (=a measurement of the temperature of an oven):

      Heat the oven to gas mark 6.

    2. b.
      [uncountable] a gas used for harming or killing people, or for affecting their behaviour

      Police used gas to disperse the crowd.

      A nerve gas attack left hundreds injured.

  2. 2
    [uncountable] American petrol
    get gas:

    We need to get some gas before we leave town.

 

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