Cathartic /(?)/

Ca·thar·tic

Cathartic

a.
  1. Cleansing the bowels; promoting evacuations by stool; purgative. (Med.)
  2. Of or pertaining to the purgative principle of senna, as cathartic acid.

Cathartic

n.
  1. A medicine that promotes alvine discharges; a purge; a purgative of moderate activity. (Med.)