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ramjet (n.)

type of jet engine, 1942, from ram (v.) + jet (n.). So called because it uses the engine's forward motion as the sole means to compress air.

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Definitions of ramjet from WordNet

ramjet (n.)
a simple type of jet engine; must be launched at high speed;
Synonyms: ramjet engine / atherodyde / athodyd / flying drainpipe
From wordnet.princeton.edu