Source : Webster's Revised Unabridged Dictionary (1913)

Colocynth \Col"ocynth\, n. [L. colocynthis, Gr. ?. Cf.
   {Coloquintida}.] (Med.)
   The light spongy pulp of the fruit of the bitter cucumber
   ({Citrullus, or Cucumis, colocynthis}), an Asiatic plant
   allied to the watermelon; coloquintida. It comes in white
   balls, is intensely bitter, and a powerful cathartic. Called
   also {bitter apple}, {bitter cucumber}, {bitter gourd}.