a substance used with water to produce suds for washing or cleaning: soaps are usually sodium or potassium salts of fatty acids, produced by the action of an alkali, as caustic soda or potash, on fats or oils
A cleansing agent, manufactured in bars, granules, flakes, or liquid form, made from a mixture of the sodium salts of various fatty acids of natural oils and fats.
A metallic salt of a fatty acid, as of aluminum or iron.
Slang Money, especially that which is used for bribery.