"propellent" in the noun sense
1. propellant, propellent
any substance that propels
"propellent" in the adjective sense
1. propellant, propellent, propelling, propulsive
tending to or capable of propelling
"propellant fuel for submarines"
"the faster a jet plane goes the greater its propulsive efficiency"
"universities...the seats of propulsive thought"
Source: WordNet® (An amazing lexical database of English)
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