retro rocket

retrorocket

[re-troh-rok-it]
noun
a small, auxiliary rocket engine, forming a part of a larger rocket vehicle and having its exhaust nozzle pointed toward the direction of flight, for decelerating the larger rocket, separating one stage from another, etc.
Also, retro-rocket.


Origin:
1945–50; retro- + rocket

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World English Dictionary
retrorocket (ˈrɛtrəʊˌrɒkɪt)
 
n
Often shortened to: retro 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

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