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From The Collaborative International Dictionary of English v.0.48:
Margarin \Mar"ga*rin\, n. [Cf. F. margarine. See Margarite.] (Physiol. Chem.) A fatty substance, extracted from animal fats and certain vegetable oils, formerly supposed to be a definite compound of glycerin and margaric acid, but now known to be simply a mixture or combination of tristearin and tripalmitin. [1913 Webster]