(klar'-if-i) [clarus; facere, to make]. To free a liquid or solution from insoluble substances; to make clear. * Clark's Sign. A tympanitic sound over the hepatic region in tympanites due to perforative peritoneal inflammation. * Clarke's Corroding Ulcer. Progressive ulcer of the cervix uteri. C.'s Tongue, the hard, fissured, and nodular tongue of syphil- itic glossitis sclerosa. C.'s Vesicular Col- umn. See Column of Clarke.