polyene

polyene

[pol-ee-een]
noun Chemistry.
a hydrocarbon containing two or more double bonds, often conjugated.

Origin:
1925–30; poly- + -ene

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World English Dictionary
polyene (ˈpɒlɪˌiːn)
 
n
a chemical compound containing a chain of alternating single and double carbon-carbon bonds

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
polyene   (pŏl'ē-ēn')  Pronunciation Key 
An organic compound containing at least four carbon atoms and at least two double bonds. Numerous naturally occurring plant pigments, such as carotenes, are polyenes.
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