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myxovirus myx·o·vi·rus (mĭk'sə-vī'rəs)
Formerly, any of a group of RNA-containing viruses with an affinity for mucins, now included in the families of Orthomyxoviridae and Paramyxoviridae. These viruses include the influenza virus, parainfluenza virus, respiratory syncytial virus, and measles virus.