1. 
   diene
   (from the article `hydrocarbon`) Compounds with more than one carbon-carbon double bond are called dienes or polyenes. They occur widely in nature and are commercially important. The ... Each of the monomers whose polymerization is described above—ethylene, vinyl chloride, propylene, and styren...
   Found op http://www.britannica.com/eb/a-z/d/47
   
   
2. 
   Diene
   In organic chemistry a diene (n {respell|DY|een}) or diolefin (n {respell|dy|OH|lə-fin}) is a hydrocarbon that contains two carbon double bonds. Conjugated dienes are functional groups, with a general formula of CnH2n-2. Dienes and alkynes are functional isomers. Dienes occur occasionally in natur...
   Found op http://en.wikipedia.org/wiki/Diene
   
   
3. 
   diene
   An unsaturated organic compound that contains two fixed double bonds between carbon atoms. Dienes in which the two double-bond units are linked by one single bond are termed conjugated. The simplest example of a diene is butadiene. See also Diels-Alder reaction.
   Found op http://www.daviddarling.info/encyclopedia/D/diene.html
   
   
4. 
   diene
   1) Compound with two carbon double bonds 2) Compound with two double bonds
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/diene/1
   
   

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