RAMJET - is a valid Scrabble word.
Definition of RAMJET:
- a jet engine that consists essentially of a hollow tube without mechanical components and depends on the aircraft's speed of flight to compress the air which is supplied to a burner from which hot gases are discharged rearward
- a type of engine [n -S]
- jet engine operated by the injection of fuel into a stream of air compressed by the forward speed of the aircraft