Definition of parainfluenza virus
: any of several paramyxoviruses (genera Respirovirus and Rubulavirus) that are a frequent cause of infections (as croup) of the lower respiratory tract especially in infants and children
First Known Use of parainfluenza virus
Medical Definition of parainfluenza virus
: any of several single-stranded RNA viruses (genera Respirovirus and Rubulavirus) of the family Paramyxoviridae that are associated with or responsible for some respiratory infections especially in children—called also
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