Main Entry: ret·ro·vi·rus

Pronunciation: \ˈre-trō-ˌvī-rəs\

Function: noun

: any of the family Retroviridae of single-stranded RNA viruses—called also RNA tumor virus

—ret·ro·vi·ral \-rəl\ adjective

—ret·ro·vi·ral·ly \-ē\ adverb