Definition of paramyxovirus
: any of a family (Paramyxoviridae) of single-stranded RNA viruses that include the parainfluenza viruses and the causative agents of canine distemper, measles, mumps, Newcastle disease, and rinderpest
Note: Respiratory syncytial virus and metapneumovirus were formerly identified as paramyxoviruses but are now classified as pneumoviruses.
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