(?), a. [F. olfiant, fr.L. oleum oil + -ficare (in comp.). Cf. -Fy.] (Chem.) Forming or producing an oil; specifically, designating a colorless gaseous hydrocarbon called ethylene (olefiant gas). [Archaic]
[1913 Webster]




("l*fn or "l*fn), 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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