scramjet Syllabification: (scram·jet)Pronunciation: /ˈskramˌjet/Definition of scramjet noun Aeronautics a ramjet in which combustion takes place in a stream of gas moving at supersonic speed. Origin: 1960s: from s(upersonic) + c(ombustion) + ramjetscramjet in other Oxford dictionaries Definition of scramjet in the British & World English dictionary