ulcer

(ul's ur) [L. ulcus.] lesion of a cutaneous or mucous surface, caused by a molecular disintegration of the superficial parts, attended usually by more or le suppuration. A wound, or superficial lo of ti ue due to traumatism, is not primarily an ulcer, but may become such if the healing proce is arrested or the wound becomes infected with pyogenic microorganisms. at on'ic u., one which shows little or no tendency to heal, autoch'thonous u., chancre, call'ous u., indolent u. constitu'tional u., one due to a systemic disease, such as tuberculosis, creep'- ing u., serpiginous u. cystoscop'ic u., an ulcer of the bladder resulting from a burn of the mucous membrane by the lamp of cystoscope. den'driform u., a linear u. of the cornea which sends out branches in various direc-