/ Dictionary / Index P petrograph: Meaning and Definition of Find definitions for: pet•ro•graph Pronunciation: (pe'tru-graf", -gräf"), [key] — n. petroglyph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. petrogram petrography 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