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propellant

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propellantnoun
alsopropellent/prəˈpɛlənt/
pluralpropellants
propellant
noun
also propellent /prəˈpɛlənt/
pluralpropellants
Learner's definition of PROPELLANT  
[count, noncount]technical
: a gas under pressure in a can that is used to spray out the contents when the pressure is released
: a fuel or an explosive substance that is used to make something (such as a rocket) go forward
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