n. A composition generally made of confectioners' sugar mixed with whites of eggs, used to cover cake, etc.: so called from its white, frosty appearance.n. A dead or lusterless surface on metal, or a similar surface on any material, produced by etching or engraving, or by a punch or die.n. A material used for decorative work, as signs, etc., made from coarsely powdered thin flakes of glass: commonly in the plural.