/ Dictionary / Index P periproct: Meaning and Definition of Find definitions for: per•i•proct Pronunciation: (per'u-prokt"), [key] — n. (in certain echinoids) that part of the body surface bordering the anus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. periplasm peripteral Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language