momordica elaterium

from The Collaborative International Dictionary of English v.0.48

Elaterium \El`a*te"ri*um\, n. [L., fr. Gr. ?, neut. of ?
   driving. See 2d {Elater}.]
   A cathartic substance obtained, in the form of yellowish or
   greenish cakes, as the dried residue of the juice of the wild
   or squirting cucumber ({Ecballium agreste}, formerly called
   {Momordica Elaterium}).
   [1913 Webster]