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jalap n. 泻药 泻药 Jalap \Jal"ap\, n. [F., fr. Sp. jalapa; -- so called from
Jalapa, a town in Mexico, whence it was first obtained.] (Med.) The tubers of the Mexican plant {Ipom[oe]a 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 {Ipom[oe]a} yield several inferior kinds of jalap, as the {Ipom[oe]a Orizabensis}, and {Ipom[oe]a tuberosa}. [1913 Webster] {False jalap}, the root of {Mirabilis Jalapa}, four-o'clock, or marvel of Peru. [1913 Webster]
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