Science Dictionary
saponin   (sāp'ə-nĭn, sə-pō'-)  Pronunciation Key 
Any of various plant glucosides that form soapy lathers when mixed and agitated with water. They are used in detergents, foaming agents, and emulsifiers. Some saponins, such as digitalis, affect the heart and have been used as medicines and arrow poisons by indigenous peoples of Africa and South America.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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