propellant
noun /prəˈpelənt/
/prəˈpelənt/
[countable, uncountable]- a gas that forces out the contents of an aerosol
- a thing or substance that propels something, for example the fuel that fires a rocket
Word Originmid 17th cent.: originally from Latin propellent- ‘driving ahead (of oneself)’, from the verb propellere, later from propel.