hy'dragog. [Gr. water, and a leading or drawing; to lead or drive.] A medicine that occasions a discharge of watery humors; a name that implies a supposition that every purgative has the quality of evacuating a particular humor. But in general, the stronger cathartics are hydragogues.

Causing a discharge of water; expelling serum effused into any part of the body, as in dropsy.

A hydragogue medicine, usually a cathartic or diuretic.