any one of a group of small viruses that contain RNA; the group includes polioviruses, rhinoviruses, coxsackie viruses, and the virus that causes foot-and-mouth disease
Word origin
C20: from pico- + RNA + virus
picornavirus in American English
(pɪˌkɔrnəˈvaɪrəs)
noun
any of a large family (Picornaviridae) of RNA viruses affecting animals, including the enteroviruses and rhinoviruses