soapbark
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soap·bark
(sōp′bärk′)n.
1. A Chilean evergreen tree (Quillaja saponaria) of the rose family, having bark used as soap and as a source of saponin.
2. The bark of this tree.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
soapbark
(ˈsəʊpˌbɑːk)n
1. (Plants) Also called: quillai a W South American rosaceous tree, Quillaja saponaria, with undivided evergreen leaves and small white flowers
2. (Forestry) Also called: quillai bark the inner bark of this tree, formerly used as soap and as a source of saponin
3. (Plants) any of several trees or shrubs that have a bark similar to this
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014