/ Dictionary / Index P picornavirus: Meaning and Definition of Find definitions for: pi•cor•na•vi•rus Pronunciation: (pi-kôr'nu-vī"rus, -kôr"nu-vī'-), [key] — pl. -rus•es. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: picornavirus (Thesaurus) Pico Rivera picosecond Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language