propellant
(also propellent), n [C, U]
propelling agent, eg an explosive that propels a bullet from a weapon, a fuel that provides thrust for a rocket, or compressed gas that forces out the contents of an aerosol container 推進劑(如武器的發射火藥、 火箭的燃料、 噴霧容器中用以產生壓力的壓縮氣體等).