Source : Webster's Revised Unabridged Dictionary (1913)

Ipomoeic \Ip`o*m[oe]"ic\, a. (Chem.)
   Pertaining to, or designating, an acid obtained by the
   oxidation of convolvulin (obtained from jalap, the tubers of
   {Ipom[oe]a purga}), and identical in most of its properties
   with sebacic acid.

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}), a climber much like the morning-glory.
   The abstract, extract, and powder, prepared from the tubers,
   are well known purgative medicines. Other species of
   Ipom[oe]a yield several inferior kinds of jalap, as the {I.
   Orizabensis}, and {I. tuberosa}.

   {False jalap}, the root of {Mirabilis Jalapa}, four-o'clock,
      or marvel of Peru.