/ Dictionary / Index P pinene: Meaning and Definition of Find definitions for: pi•nene Pronunciation: (pī'nēn), [key] — n. Chem. a liquid terpene, CH, the principal constituent of oil of turpentine, found in other essential oils: used chiefly in the manufacture of camphor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pine mouse pine needle Related Content Daily Word Quiz: leonine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language