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Ru·bu·la·vi·rus .rü-byə-lə-'vī-rəs n a genus of single-stranded RNA viruses of the family Paramyxoviridae that includes several parainfluenza viruses and the causative agents of mumps and Newcastle disease
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Ru·bu·la·vi·rus (rooґbu-lə-vi″rəs) [L. rubula inflans mumps] a genus of viruses of the subfamily Paramyxovirinae (family Paramyxoviridae); species that cause human disease include human parainfluenza viruses 2 and 4 and mumps virus.Medical dictionary. 2011.