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plural cascaras
A North American buckthorn (Frangula purshiana, syn. Rhamnus purshiana) whose bark is used as a laxative. examples
A laxative drug or preparation based on this plant. quotations examples
"That's as bitter as a dose of cascara."
1972, John O'Grady, It's Your Shout, Mate, Ure Smith, page 60
Dried coffee cherry fruit used in teas and other drinks. examples