Webster's Revised Unabridged Dictionary · 1913

Margarine

Margarine (mar"ju*rin; mar`ju*rēn") , noun

[French; see margarin.]

1.
A processed food product used as an inexpensive substitute for butter, made primarily from refined vegetable oils, sometimes including animal fats, and churned with skim milk to form a semisolid emulsion; also called oleomargarine; artificial butter.
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.