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Related to saponin: tannin
Any of various plant glycosides that form soapy lathers when mixed and agitated with water, used in detergents, foaming agents, and emulsifiers.
[From Latin sāpō, sāpōn-, hair dye, of Germanic origin.]
(Botany) any of a group of plant glycosides with a steroid structure that foam when shaken and are used in detergents
[C19: from French saponine, from Latin sāpō soap]
sap•o•nin(ˈsæp ə nɪn)
any of various glucosides, obtained from soapwort and other plants, that form a stable foam in water: used commercially in beverages, fire extinguishers, and detergents.