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]
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