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New American Oxford Dictionary

polyene

pol y ene |ˈpälēˌēn ˈpɑliˌin | ▶noun Chemistry a hydrocarbon with several carbon –carbon double bonds, esp. one having a chain of alternating single and double bonds.

 

Oxford Dictionary

polyene

polyene |ˈpɒlijiːn | ▶noun Chemistry a hydrocarbon with several carbon –carbon double bonds, especially one having a chain of conjugated single and double bonds.