/pi kawr"neuh vuy'reuhs, -kawr'neuh vuy"-/ , n. , pl. picornaviruses .
any of a group of small, RNA-containing viruses of the family Picornaviridae, infectious to humans and other animals, and including the poliovirus and the rhinoviruses that cause the common cold.
[ 1960-65; PICO- (in the sense "very small") + RNA + VIRUS ]