Caliciviridae

noun plural

Cal·​i·​ci·​vi·​ri·​dae kə-ˌlis-ə-ˈvir-ə-ˌdē, -ˌlē-sē-, -ˌlē-chē- 

: a family of single-stranded RNA viruses with icosahedral symmetry that have numerous cup-shaped depressions on the surface but no lipoprotein envelope forming the outer layer of the virion and that include the Norwalk virus and the causative viruses of hepatitis E and vesicular exanthema