Reaction-engine definition

An engine that develops thrust by the focused expulsion of matter, especially ignited fuel gases.
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An engine, as a jet or rocket engine, that generates thrust by the reaction to an ejected stream of hot exhaust gases, ions, etc.
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Any engine that generates thrust by expelling matter, especially hot gases produced by igniting a fuel; either a rocket engine or several types of jet engine.
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Other Word Forms

Noun

Singular:
reaction-engine
Plural:
reaction engines