a jet engine operated by the injection of fuel into a stream of air compressed by the forward speed of the aircraft.
Also called ramjet engine.

1940–45; ram + jet1

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World English Dictionary
ramjet or ramjet engine (ˈræmˌdʒɛt)
Also called: athodyd
 a.  a type of jet engine in which fuel is burned in a duct using air compressed by the forward speed of the aircraft
 b.  an aircraft powered by such an engine
ramjet engine or ramjet engine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1942. from ram (v.) + jet.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ramjet   (rām'jět')  Pronunciation Key 
A cylindrical jet propulsion engine consisting of air intake and combustion chambers into which burning fuel is injected, forcing hot air out of the rear of the engine at high pressures to provide forward thrust. See Note at turbojet.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The ramjet is a simple engine that lacks a turbine and compression chambers.
The rocket-ramjet mode is not nearly as efficient as the ramjet mode.
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