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saponin

sap·o·nin [ sáppənin, sə pṓnin ] (plural sap·o·nins)


noun 
Definition:
 
soap from plant: a glucoside extracted from plants that forms a soapy lather when mixed with water. Use: detergents.

[Mid-19th century. < French saponine< Latin sapon- (see saponify)]
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