terpene

n. (Chemistry) C5H8, compound found in plant essential oils and which belongs to the family of natural unsaturated hydrocarbons derived from isoprene units (aromatic that is used in food and perfumes)

Terpenes are a large and varied class of hydrocarbons, produced primarily by a wide variety of plants, particularly conifers, though also by some insects such as swallowtail butterflies, which emit terpenes from their osmeterium. They are the major components of resin, and of turpentine produced from resin. The name "terpene" is derived from the word "turpentine".
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Terpene /ter·pene/ any hydrocarbon of the formula C10H16. ter·pene n. Any of various unsaturated hydrocarbons in essential oils and certain resins [more]Terpene - Community and Resources

Noun
1. an unsaturated hydrocarbon obtained from plants
(hypernym) hydrocarbon
(hyponym) limonene

n. terpene, family of chemical substances derived from plants