soap bark


a Chilean tree, Quillaja saponaria, of the rose family, having evergreen leaves and small, white flowers.
the inner bark of this tree, used as a substitute for soap.

1860–65; soap + bark2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
soapbark (ˈsəʊpˌbɑːk)
1.  Also called: quillai a W South American rosaceous tree, Quillaja saponaria, with undivided evergreen leaves and small white flowers
2.  Also called: quillai bark the inner bark of this tree, formerly used as soap and as a source of saponin
3.  any of several trees or shrubs that have a bark similar to this

Collins English Dictionary - Complete & Unabridged 10th Edition
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