Definition of cascara buckthorn
: a buckthorn (Rhamnus purshiana) of the Pacific coast of the U.S. yielding cascara sagrada
First Known Use of cascara buckthorn
Medical Definition of cascara buckthorn
: a buckthorn of the genus Rhamnus (R. purshiana) of the Pacific coast of the United States yielding cascara sagrada—called also cascara, coffeeberry
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