Answer: paramyxovirus

AnswerCrossword Clue
paramyxovirusAny of a group of RNA viruses similar to the myxoviruses but larger and hemolytic, including those causing mumps, measles, distemper, rinderpest, and various respiratory infections (parainfluenza)
paramyxovirusany of a group of viruses which includes the mumps and measles viruses