/ Dictionary / Index P petrochemical: Meaning and Definition of Find definitions for: pet•ro•chem•i•cal Pronunciation: (pe"trō-kem'i-kul), [key] — n. a chemical substance obtained from petroleum or natural gas, as gasoline, kerosene, or petrolatum. —adj. of or pertaining to petrochemistry or a petrochemical. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: petrochemical (Thesaurus) Petrobrusian petrochemistry Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language