terpenoid

Science Dictionary
terpenoid   (tûr'pə-noid')  Pronunciation Key 
Any of a class of hydrocarbons that consist of terpenes attached to an oxygen-containing group. Terpenoids are widely found in plants, and can form cyclic structures such as sterols.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

terpenoid

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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