paramyxovirus

noun, plural par·a·myx·o·vi·rus·es.

1. 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.

n.

1. A member of the genus Paramyxovirus.

n.

1. A genus of viruses that contain RNA and are similar to but larger and more variable in size than the related myxovirus; it includes the Sendai virus, the parainfluenza viruses, and the viruses that cause measles and mumps.