cathar'tin

Cathartic acid, an extractive from rhubarb and senna a brownish powder, cathartic in doses of gr. 2-5 (0.13-0.3). Cathelin, Paris i an urologist, contemporary.] A rubber membrane attached to a very fine steel frame which, when introduced into the bladder, adapts itself to the inequalities of the inner surface dividing it into two compartments used as a means of separating the portions of urine coming from the two ureters.