The formation of a break on the skin or on the surface of an organ. An ulcer forms when the surface cells die and are cast off. Ulcers may be associated with cancer and other diseases. Found on http://www.cancer.gov/dictionary?expand=U
1. <pathology> The formation or development of an ulcer. ... 2. An ulcer. ... Origin: L. Ulceratio ... (18 Nov 1997) ... Found on http://www.encyclo.co.uk/local/20973
A localized defect in the skin of irregular size and shape where epidermis and some dermis have been lost. Leaves a concavity in the skin. Found on https://www.encyclo.co.uk/local/21553