[ sohp-bahrk ]
/ ˈsoʊpˌbɑrk /


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.

Origin of soapbark

First recorded in 1860–65; soap + bark2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for soapbark

/ (ˈsəʊpˌbɑːk) /


Also called: quillai a W South American rosaceous tree, Quillaja saponaria, with undivided evergreen leaves and small white flowers
Also called: quillai bark the inner bark of this tree, formerly used as soap and as a source of saponin
any of several trees or shrubs that have a bark similar to this
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012