![rna virus rna virus](https://www.tekportal.net/wp-content/uploads/2018/11/rna-virus.jpg)
noun
- any virus containing RNA; retrovirus.
n.
- Any of a group of viruses whose nucleic acid core is composed of RNA, including the picornaviruses, retroviruses, and paramyxoviruses.
- A virus whose genome is composed of RNA. Retroviruses are RNA viruses. Compare DNA virus.