Rodent

(rot-dent). Eating; gnawing. R. Cancer. See R. Ulcer. R. Ulcer, Jacob's ulcer; cancroid ulcer; ulcus excedens; noli me tan gere; a carcinomatous ulceration of the skin, generally held to be a form of epithelioma, occurring usually in the eyelid or the side of the nose, and frequently persisting for years before developing malignancy.