a substance used for washing and cleansing purposes, usually made by treating a fat with an alkali, as sodium or potassium hydroxide, and consisting chiefly of the sodium or potassium salts of the acids contained in the fat.
any metallic salt of an acid derived from a fat.
Slang. money, especially as used for bribery in politics.
a cleaning or emulsifying agent made by reacting animal or vegetable fats or oils with potassium or sodium hydroxide. Soaps often contain colouring matter and perfume and act by emulsifying grease and lowering the surface tension of water, so that it more readily penetrates open materials such as textilesSee also detergent Related adjective: saponaceous
any metallic salt of a fatty acid, such as palmitic or stearic acidSee also metallic soap
slangflattery or persuasive talk (esp in the phrase soft soap)
Old English sape "soap, salve" (originally a reddish hair dye used by Germanic warriors to give a frightening appearance), from Proto-Germanic *saipon "dripping thing, resin" (cf. Middle Low German sepe, West Frisian sjippe, Dutch zeep, Old High German seiffa, German seife "soap," Old High German seifar "foam," Old English sipian "to drip"), from PIE *soi-bon-, from root *seib- "to pour out, drip, trickle" (cf. Latin sebum "tallow, suet, grease").
Romans and Greeks used oil to clean skin; the Romance language words for "soap" (cf. Italian sapone, French savon, Spanish jabon) are from Late Latin sapo "pomade for coloring the hair" (first mentioned in Pliny), which is a Germanic loan-word, as is Finnish saippua. The meaning "flattery" is recorded from 1853.
A substance used for washing or cleaning, consisting of a mixture of sodium or potassium salts of naturally occurring fatty acids. Like detergents, soaps work by surrounding particles of grease or dirt with their molecules, thereby allowing them to be carried away. Unlike detergents, soaps react with the minerals common in most water, forming an insoluble film that remains on fabrics. For this reason soap is not as efficient a cleaner as most detergents. The film is also what causes rings to form in bathtubs. Compare detergent.