Retroviridae

noun plural

Ret·​ro·​vi·​ri·​dae ˌre-trō-ˈvir-ə-ˌdē 

: 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