| insoluble soap | Soap made with a fatty acid and an earthy or metallic base (iron or calcium salts of fatty acids). (05 Mar 2000) |
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| tallow soap | Soap made with sodium hydroxide and a purified animal fat consisting chiefly of stearin; used in pharmacy in the preparation of certain liniments. Synonym: curd soap, domestic soap, tallow soap. (05 Mar 2000) |