saponin
/ˈsæpənɪn/
noun
- A natural chemical found in some plants that creates a soapy lather when mixed with water.
- The plant's roots are rich in saponin and produce a frothy foam.
- Soap nuts contain saponin, which can be used as a natural laundry detergent.
- Some people use saponin from quinoa to make natural cleaning products.