O‐le″fi‐ant (?), a. [F. oléfiant, fr.L. oleum oil + -ficare (in comp.). Cf. -Fy.] (Chem.) Forming or producing an oil; specifically, designating a colorless gaseous hydrocarbon called ethylene.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.