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reaction engine

noun, Aeronautics, Rocketry.
1.
an engine that produces power as a reaction to the momentum given to gases ejected from it, as a rocket or jet engine.
Also called reaction motor.
Origin
1865-1870
1865-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for re-action motor

reaction engine

noun
1.
an engine, such as a jet or rocket engine, that ejects gas at high velocity and develops its thrust from the ensuing reaction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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