/ Dictionary / Index P petr-: Meaning and Definition of Find definitions for: petr- Pronunciation: [key] var. of before a vowel: petrous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pet peeve Petra 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