Etymology
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propellant (n.)

"driving forward, propelling," the less-etymological, but more usual, modern spelling of propellent,1640s, from propel + -ent. As a noun from 1814, "that which propels or drives forward;" by 1881 as "a firearm explosive;" by 1919 as "fuel for a rocket engine."

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Definitions of propellant
1
propellant (n.)
any substance that propels;
Synonyms: propellent
2
propellant (adj.)
tending to or capable of propelling;
propellant fuel for submarines
Synonyms: propellent / propelling / propulsive
From wordnet.princeton.edu