/ Dictionary / Index P polioencephalitis: Meaning and Definition of Find definitions for: po•li•o•en•ceph•a•li•tis Pronunciation: (pō'lē-ō-en-sef"u-lī'tis), [key] — n. Pathol. a disease characterized by inflammation of the gray matter of the brain. poliomyelitis affecting the cerebrum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polio poliomyelitis 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