catharical

{ } a. [ Gr. &unr_;, fr. &unr_; to cleanse, fr. &unr_; pure; akin to F. chaste. ] 1. (Med.) Cleansing the bowels; promoting evacuations by stool; purgative. [ 1913 Webster ]

2. Of or pertaining to the purgative principle of senna, as cathartic acid. [ 1913 Webster ]