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noun Jalap n. (Med.) The tubers of the Mexican plant Ipomoea purga (or Exogonium purga) of the family Convolvulaceae, a climber much like the morning-glory. The abstract, extract, and powder, prepared from the tubers, are well known purgative (cathartic) medicines, and are also called jalap. Other species of Ipomoea yield several inferior kinds of jalap, as the Ipomoea Orizabensis, and Ipomoea tuberosa. False jalap, the root of Mirabilis Jalapa, four-o'clock, or marvel of Peru.
Collaborative International Dictionary of English 0.48
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