Definition of ulcer

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< Ulbricht, Walter

ulcerate >

ul·cer

(

r) KEY

NOUN:

A lesion of the skin or 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.
A corrupting condition or influence.

ETYMOLOGY:
Middle English, from Old French ulcere, from Latin ulcus , ulcer-

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The American Heritage® Dictionary of the English Language, Fourth Edition.
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