cascara

noun

1. a buckthorn, Rhamnus purshiana, of the Pacific coast of the U.S., having finely toothed leaves and flowers in umbels and yielding cascara sagrada.

noun

1. See cascara sagrada
2. Also called: cascara buckthorn, bearwood a shrub or small tree, Rhamnus purshiana of NW North America, whose bark is a source of cascara sagrada: family Rhamnaceae