propellant

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pro|pel|lant /prəp'elənt/ (propellants)
1 [N-MASS]
Propellant is a substance that causes something to move forwards.
...a propellant for nuclear rockets.
2 [N-MASS]
Propellant is a gas that is used in spray cans to force the contents out of the can when you press the button.
By 1978, in the USA, the use of CFCs in aerosol propellants was banned.

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