Togaviridae

noun plural

To·​ga·​vi·​ri·​dae ˌto-gə-ˈvir-ə-ˌdē 

: a family of single-stranded RNA viruses that have a spherical virion about 70 nanometers in diameter and that include the causative agents of chikungunya and the three forms of equine encephalitis see alphavirus