propellant

(prə pelənt, prō-)

noun

a person or thing that propels; specif.,
  1. the explosive charge that propels a projectile from a gun
  2. ☆ the fuel and oxidizer used to propel a rocket

See propellant in American Heritage Dictionary 4

also pro·pel·lent

noun
  1. Something, such as an explosive charge or a rocket fuel, that propels or provides thrust.
  2. A compressed inert gas, such as a fluorocarbon, that acts as a vehicle for discharging the contents of an aerosol container.
adjective
Serving to propel; propelling.

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