propellant

noun4

1. •
   anything that propels
2. •
   fuel, oxidizer, reaction mass or mixture for one or more engines (especially internal combustion engines or jet engines) that is carried within a vehicle prior to use
3. •
   the compressed gas in a pressurised container (especially an aerosol can) that is used to expel its content

   • Then they backed the membrane with a gel matrix containing a perfluorocarbon (PFC) propellant and fluorescent "nanobullets" about a micron wide, and hit it with ultrasound. — 2016
4. •
   the explosive (cordite, gunpowder, etc) found in ammunition cartridges