any paramyxovirus or orthomyxovirus: a name for viruses of a former family that is now subdivided into two separate families
See myxovirus in American Heritage Dictionary 4
(mĭkˈsə-vīˌrəs)
nounpl.myx·o·vi·rus·es
Any of a group of RNA-containing viruses, including those that cause influenza, typically having an affinity for certain mucins and causing agglutination of red blood cells.