Retroviridae

noun plural
Ret·ro·vi·ri·dae | \ˌre-trō-ˈvir-ə-ˌdē \

Medical Definition of Retroviridae 

: a family of single-stranded RNA viruses that produce reverse transcriptase by means of which DNA is synthesized using their RNA as a template and incorporated into the genome of infected cells, that are often tumorigenic, and that include the foamy viruses, HIV, HTLV-I, Rous sarcoma virus, SIV, and the causative agents of avian leukosis, equine infectious anemia, ovine progressive pneumonia, and jaagsiekte — see lentivirus

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