n. [ Gr. &unr_;. ] (Med.) A medicine that promotes alvine discharges; a purge; a purgative of moderate activity. [ 1913 Webster ]
☞ The cathartics are more energetic and certain in action that the laxatives, which simply increase the tendency to alvine evacuation; and less powerful and irritaint that the drastic purges, which cause profuse, repeated, and watery evacuations.
-- Ca*thar"tic*al*ly, adv. -- Ca*thar"tic*al*ness, n. [ 1913 Webster ]
n. (Chem.) The bitter, purgative principle of senna. It is a glucoside with the properties of a weak acid; -- called also cathartic acid, and cathartina. [ 1913 Webster ]
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