English edit

 

Etymology edit

soap +‎ nut

Noun edit

soapnut (plural soapnuts)

  1. The drupe of Sapindus plants, containing saponins, which are a natural surfactant.
    • 2015, Beth Terry, Plastic-Free: How I Kicked the Plastic Habit and How You Can Too[1], Simon and Schuster, →ISBN:
      Soapnuts are the dried fruit of a tree called Sapindus mukorossi (Chinese Soapberry) and contain saponin, a natural surfactant that foams just like soap.

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