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Retroviridae
Definition 1
A family of viruses that possess RNA-dependent DNA polymerases (reverse transcriptases) and contain two identical molecules of positive sense, single-stranded RNA of high molecular weight. This RNA serves as a template for the synthesis of a complementary DNA, which may be integrated into the host DNA. Virions are enveloped. (NCI Thesaurus)
Definition 2
A type of virus that has RNA instead of DNA as its genetic material. It uses an enzyme called reverse transcriptase to become part of the host cells' DNA. This allows many copies of the virus to be made in the host cells. The virus that causes AIDS, the human immunodeficiency virus (HIV), is a type of retrovirus. (NCI Dictionary)
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