/ Dictionary / Index L limonene: Meaning and Definition of Find definitions for: lim•o•nene Pronunciation: (lim'u-nēn"), [key] — n. Chem. a liquid terpene, CH, occurring in two optically different forms, the dextrorotatory form being present in the essential oils of lemon, orange, etc., and the levorotatory form in Douglas fir needle oil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: limonene (Thesaurus) Limón limonite Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language