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    olefine
    [ noun ]
    any unsaturated aliphatic hydrocarbon
    <noun.substance>


    olefin \o"le*fin\, olefine \o"le*fine\([=o]"l[-e]*f[i^]n or
    [=o]"l[-e]*f[=e]n), n. [From {Olefiant}.]
    1. (Chem.) Olefiant gas, or ethylene. See {Ethylene}.
    [archaic]

    2. Hence: (Chem.) Any one of the series of unsaturated
    hydrocarbons of which ethylene is the type; a member of
    the alkene series of hydrocarbons; an alkene.
    [1913 Webster + PJC]

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