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The dried tuberous root of Exogonium purga, E. jalapa, or Ipomoea purga (family Convolvulaceae); used as a cathartic.
[Jalapa or Xalapa, a Mexican city from which the drug was exported]
1. A twining eastern Mexican vine (Ipomoea purga) having tuberous roots that are dried, powdered, and used medicinally as a purgative.
2. The purgative drug obtained from the roots of this plant or related plants.
the dried root of Exogonium purga. A violent cathartic long since purged from the pages of pharmacology textbooks.