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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