Hemiterpene

[hem-i-tur-peen] /ˌhɛm ɪˈtɜr pin/

noun, Chemistry.
1.
See under (def 2).
[tur-peen] /ˈtɜr pin/
noun, Chemistry.
1.
(originally) any of a class of monocyclic hydrocarbons of the formula C 10 H 16 , obtained from plants.
2.
this class or any of its oxygenated derivatives, any hydrocarbon from the same source having the formula C 5 H 8 (hemiterpene) the formula C 10 H 16 with an aliphatic structure (acyclic terpene) or two-ringed structure (bicyclic terpene) the formula C 15 H 24 (sesquiterpene) etc., and any of their oxygenated derivatives.
/ˌhɛmɪˈtɜːpiːn/
noun
1.
any of a class of simple unsaturated hydrocarbons, such as isoprene, having the formula C5H8
/ˈtɜːpiːn/
noun
1.
any one of a class of unsaturated hydrocarbons, such as the carotenes, that are found in the essential oils of many plants. Their molecules contain isoprene units and have the general formula (C5H8)n

terpene ter·pene (tûr’pēn’)
n.
Any of various unsaturated hydrocarbons in essential oils and certain resins of plants and used in organic syntheses.
terpene
(tûr’pēn’)
Any of a class of hydrocarbons consisting of two or more isoprene (C5H8) units joined together. Simple terpenes are found in the essential oils and resins of plants such as conifers. Turpentine, for example, is such an oil. More complex terpenes include vitamin A, carotenoid pigments (such as lycopene), squalene, and rubber. Terpenes are used in organic synthesis.