Seneca root
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| (Bot.) | the rootstock of an American species of milkworth (Polygala Senega) having an aromatic but bitter taste. It is often used medicinally as an expectorant and diuretic, and, in large doses, as an emetic and cathartic. |
See also: Senecas
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.