Definitions for ramjetˈræmˌdʒɛt
Random House Webster's College Dictionary
a jet engine operated by fuel injected into a stream of air compressed by the aircraft's forward speed.
Origin of ramjet:
ramjet, ramjet engine, atherodyde, athodyd, flying drainpipe(noun)
a simple type of jet engine; must be launched at high speed
A jet engine in which forward motion forces air into an inlet, compressing it (as opposed to having a pump type device compressing the air for combustion with fuel), and where combustion is subsonic.
Dictionary of Military and Associated Terms
A jet-propulsion engine containing neither compressor nor turbine which depends for its operation on the air compression accomplished by the forward motion of the engine. See also pulsejet.