/par'euh mik"seuh vuy'reuhs, -mik'seuh vuy"-/ , n. , pl. paramyxoviruses .
any of various RNA-containing viruses that are similar to but larger than the myxoviruses, including the viruses that cause mumps, measles, parainfluenza, and Newcastle disease.
[ 1960-65; PARA- 1 + MYXOVIRUS ]