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Related to retrorocket: retroactive
A rocket engine used to retard, arrest, or reverse the motion of a vehicle, such as an aircraft, missile, or spacecraft.
(Astronautics) a small auxiliary rocket engine on a larger rocket, missile, or spacecraft, that produces thrust in the opposite direction to the direction of flight in order to decelerate the vehicle or make it move backwards. Often shortened to: retro
ret•ro•rock•et(ˈrɛ troʊˌrɒk ɪt)
a small auxiliary rocket engine with its exhaust nozzle aimed in the direction of flight, used for decelerating a larger rocket, separating one stage from another, etc.