Medical Definition of burdock
1: any of a genus (Arctium) of coarse composite herbs bearing globular flower heads with prickly bracts and including one (A. lappa) that has an edible root used as a vegetable and in herbal medicine
2 or burdock root : the edible root of the burdock (Arctium lappa) <Herbalists use dried burdock as a diuretic and a blood-purifying agent.—Kathryn Shattuck, The New York Times, 20 July 2008>—called also
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