Webster 1913 Edition
[F., fr. Sp.
jalapa; – so called from
Jalapa, a town in Mexico, whence it was first obtained.]
The tubers of the Mexican plant
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
Ipomœayield several inferior kinds of jalap, as the
Ipomœa Orizabensis, and
the root of
Mirabilis Jalapa, four-o’clock, or marvel of Peru.
Webster 1828 Edition