noun Aeronautics, Rocketry.
an engine that produces power as a reaction to the momentum given to gases ejected from it, as a rocket or jet engine.
Origin of reaction engine
First recorded in 1865–70
Also called reaction motor.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for reaction engine
It revolved by the agency of steam, and was of the form that we should now call a reaction-engine.History of the Conflict Between Religion and Science|John William Draper
British Dictionary definitions for reaction engine
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