/ Dictionary / Index P pyrophoric: Meaning and Definition of Find definitions for: py•ro•phor•ic Pronunciation: (pī"ru-fôr'ik, -for'-), [key] — adj. Chem. capable of igniting spontaneously in air. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyrophobia pyrophosphate Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language