n. A chemical compound in common domestic use for washing and cleansing, made by the union of certain fatty acids with a salifiable base.n. A kind of pomade for coloring the hair.n. Smooth words; persuasion; flattery: more often called soft soap.n. Money secretly used for political purposes.n. white Castile soap, which contains 21 per cent of water, is of a pale grayish-white color, giving no oily stains to paper, free from rancid odor, and entirely soluble in alcohol or water; andn. marbled Castile soap, which is harder and more alkaline, contains 14 per cent. of water, and has veins or streaks of ferruginous matter running through it. Formerly also, erroneously, castle-soap; also Spanish soap.n. See def. 3.To rub or treat with soap; apply soap to.To use smooth words to; flatter.n. The fatty matter obtained by adding just enough acid to a soap solution to cause the separation of the fatty acids.In calico-printing, to remove, by means of soap, impurities from (cloth) before bleaching; also, after printing, to remove the thickening used in the color.