/ Dictionary / Index P Petrinism: Meaning and Definition of Find definitions for: Pe•trin•ism Pronunciation: (pē'tru-niz"um), [key] — n. the body of theological doctrine taught by, or attributed to, the apostle Peter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Petrine petro Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language