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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The bottom unit consisted essentially of four landing struts equipped with a retrorocket to cushion the descent.
They could have saved themselves loads of grief by including a small, solid-fuel retrorocket in the satellite design.
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