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hemiterpene

[hem-i-tur-peen] /ˌhɛm ɪˈtɜr pin/
noun, Chemistry
1.
See under terpene (def 2).
Origin

terpene

[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.
Origin
1865-70; alteration of terebene, with p from turpentine
Related forms
terpeneless, adjective
terpenic
[tur-pee-nik] /tɜrˈpi nɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hemiterpene

hemiterpene

/ˌhɛmɪˈtɜːpiːn/
noun
1.
any of a class of simple unsaturated hydrocarbons, such as isoprene, having the formula C5H8

terpene

/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
Derived Forms
terpenic, adjective
Word Origin
C19: terp- from obsolete terpentineturpentine + -ene
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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hemiterpene in Medicine

terpene ter·pene (tûr'pēn')
n.
Any of various unsaturated hydrocarbons in essential oils and certain resins of plants and used in organic syntheses.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hemiterpene in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for hemiterpene

terpene

any of a class of hydrocarbons occurring widely in plants and animals and empirically regarded as built up from isoprene, a hydrocarbon consisting of five carbon atoms attached to eight hydrogen atoms (C5H8). The term is often extended to the terpenoids, which are oxygenated derivatives of these hydrocarbons.

Learn more about terpene with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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