Definition of soapbark
: a Chilean tree (Quillaja saponaria) of the rose family with glossy leaves and terminal white flowers; also : its saponin-rich bark used in cleaning and in emulsifying oils
First Known Use of soapbark
Medical Definition of soapbark
1: a Chilean tree of the genus Quillaja (Q. saponaria) with shiny leaves and white flowers
2: the saponin-rich bark of the soapbark tree used in cleaning and in emulsifying oil—called also quillaja
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