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 推进剂(如武器的发射火药、 火箭的燃料、 喷雾容器中用以产生压力的压缩气体等).