/ Dictionary / Index P poliovirus: Meaning and Definition of Find definitions for: po•li•o•vi•rus Pronunciation: (pō'lē-ō-vī"rus, pō"lē-ō-vī'-), [key] — pl. -rus•es. any of three picornaviruses of the genus Enterovirus, having a spherical capsid, infectious to humans and the cause of poliomyelitis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: poliovirus (Thesaurus) polio vaccine polis Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language