/ Dictionary / Index P periarteritis: Meaning and Definition of Find definitions for: per•i•ar•te•ri•tis Pronunciation: (per"ē-är"tu-rī'tis), [key] — n. Pathol. inflammation of the outer coat and tissues surrounding an artery. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: periarteritis (Thesaurus) periapt periarteritis nodosa Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language