saponin

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saponin

 [sap´o-nin]
any of a group of glycosides widely distributed in the plant world; they are powerful surfactants, form durable foam when their watery solutions are shaken, and can dissolve erythrocytes even when highly diluted.

saponin

(săp′ə-nĭn, sə-pō′-)
n.
Any of various plant glycosides that form soapy lathers when mixed and agitated with water, used in detergents, foaming agents, and emulsifiers.