Source : Webster's Revised Unabridged Dictionary (1913)

Olefine \O"le*fine\, n. [From {Olefiant}.] (Chem.)
   Olefiant gas, or ethylene; hence, by extension, any one of
   the series of unsaturated hydrocarbons of which ethylene is a
   type. See {Ethylene}.

Source : WordNet®

olefine
     n : any unsaturated aliphatic hydrocarbon [syn: {alkene}, {olefin}]