/ Dictionary / Index P polyarteritis: Meaning and Definition of Find definitions for: pol•y•ar•te•ri•tis Pronunciation: (pol"ē-är"tu-rī'tis), [key] — n. Pathol. inflammation of the layers of an artery or of many arteries, usually caused by a severe hypersensitivity reaction, and characterized by nodules and hemorrhage along the involved vessels. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polyarteritis (Thesaurus) polyarchy polyarthritis Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language