a group of viruses including those causing mumps and measles

A type of virus that has hemagglutinin-neuraminidase proteins in the outer coat and RNA as the genetic material. Measles (rubeola) virus, mumps virus, and Newcastle disease virus are paramyxoviruses.

Any of a group of viruses that contain RNA and are similar to but larger and more variable in size than the related myxovirus. The paramyxoviruses include the Sendai virus, the parainfluenza viruses, and the viruses that cause measles and mumps.