/ Dictionary / Index P pyrocrystalline: Meaning and Definition of Find definitions for: py•ro•crys•tal•line Pronunciation: (pī"ru-kris'tl-in, -īn", -ēn"), [key] — adj. Petrog. crystallized from a molten magma or highly heated solution. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyroconductivity pyroelectric Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language