/ Dictionary / Index P pyrochemical: Meaning and Definition of Find definitions for: py•ro•chem•i•cal Pronunciation: (pī"ru-kem'i-kul), [key] — adj. pertaining to or producing chemical change at high temperatures. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrochemical (Thesaurus) pyrocellulose pyrochlore 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