Definition: One of a class of hydrocarbons with an empiric formula of C10H16, occurring in essential oils and resins. Acyclic terpenes may be regarded as isomers and polymers of isoprene units; cyclic forms include menthane, bornane, and camphene. Terpenes containing 15, 20, 30, 40, etc., carbon atoms are called sesquiterpenes, diterpenes, triterpenes, tetraterpenes, etc.
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Examples: glitazone, GI cocktail, etc.