Source : Webster's Revised Unabridged Dictionary (1913)

Margarine \Mar"ga*rine\, n. [F.]
   1. Artificial butter; oleomargarine.

            The word margarine shall mean all substances,
            whether compounds or otherwise, prepared in
            imitation of butter, and whether mixed with butter
            or not.                               --Margarine
                                                  Act, 1887 (50
                                                  & 51 Vict. c.
                                                  29).

   2. Margarin.

Source : WordNet®

margarine
     n : a spread made chiefly from vegetable oils and used as a
         substitute for butter [syn: {margarin}, {oleo}, {oleomargarine},
          {marge}]