1. a South American tree whose bark contains saponins and is used for making soap and medicine
2. the bark of this tree used as a natural soap substitute

Examples

• The indigenous people have used soapbark for centuries to clean their clothes.
• Soapbark extract is still used in some natural shampoos today.
• The tree’s soapbark contains natural compounds that create a lathering effect.
• Traditional medicine practitioners value soapbark for its cleansing properties.
• You can find soapbark growing in the mountainous regions of Chile.
• The foam produced by soapbark is gentler than many commercial detergents.