[dahy-een, dahy-een]
noun Chemistry.
any compound, as 1,3-butadiene, CH 2 =CH−CH=CH 2 , that contains two double bonds.
Also called diolefin.

1915–20; di-1 + -ene

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World English Dictionary
diene (ˈdaɪiːn)
chem a hydrocarbon that contains two carbon-to-carbon double bonds in its molecules
[from di-1 + -ene]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Repeat at will at the newly obtained peripheral cis-diene sites.
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