Pronunciation: (pru-pel'unt), [key]
1. a propelling agent.
2. the charge of explosive used to propel the projectile from a gun.
3. a substance, usually a mixture of fuel and oxidizer, for propelling a rocket.
4. a compressed inert gas that serves to dispense the contents of an aerosol container when the pressure is released.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.