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The Collaborative International Dictionary of English v.0.48 (gcide)

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]
[1913 Webster]

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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