limonene

noun Chemistry.

1. a liquid terpene, C40H16, 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.

noun

1. a liquid optically active terpene with a lemon-like odour, found in lemon, orange, peppermint, and other essential oils and used as a wetting agent and in the manufacture of resins. Formula: C 10 H 16