ulcer

noun

1. Pathology. a sore on the skin or a mucous membrane, accompanied by the disintegration of tissue, the formation of pus, etc.
2. peptic ulcer.
3. any chronically corrupting or disrupting condition, element, etc.

noun

1. a disintegration of the surface of the skin or a mucous membrane resulting in an open sore that heals very slowlySee also peptic ulcer
2. a source or element of corruption or evil

n.c.1400, from Old French ulcere, from Vulgar Latin ulcerem, from Latin ulcus (genitive ulceris) “ulcer,” from PIE *elk-es- “wound” (cf. Greek elkos). n.

1. A lesion of the skin or of a mucous membrane, such as the one lining the stomach or duodenum, that is accompanied by formation of pus and necrosis of surrounding tissue, usually resulting from inflammation or ischemia.

1. A break in the skin or a mucous membrane, such as the one lining the stomach or duodenum, accompanied by inflammation, pus, and loss of tissue.

An inflamed open sore on the skin or mucous membrane. An ulcer may form in the inner lining of the stomach or duodenum, interfere with digestion, and cause considerable pain.