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plural soapnuts
The drupe of Sapindus plants, containing saponins, which are a natural surfactant. quotations examples
Soapnuts are the dried fruit of a tree called Sapindus mukorossi (Chinese Soapberry) and contain saponin, a natural surfactant that foams just like soap.
2015, Beth Terry, Plastic-Free: How I Kicked the Plastic Habit and How You Can Too, Simon and Schuster