Saponin definitions

săp'ə-nĭn, sə-pō'-
Any of various plant glycosides that form soapy lathers when mixed and agitated with water, used in detergents, foaming agents, and emulsifiers.
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Any of a group of glycosides, found in soapbark, etc., which form a soapy foam when dissolved in water: used as detergents, etc.
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Any of various plant glycosides that form soapy lathers when mixed and agitated with water, used in detergents, foaming agents, and emulsifiers.
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Any of various plant glucosides that form soapy lathers when mixed and agitated with water. They are used in detergents, foaming agents, and emulsifiers. Some saponins, such as digitalis, affect the heart and have been used as medicines and arrow poisons by indigenous peoples of Africa and South America.
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(organic chemistry, biochemistry) Any of various steroid glycosides found in plant tissues that dissolve in water to give a soapy froth.
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Origin of saponin

From Latin sāpō sāpōn- hair dye of Germanic origin