/ul"seuhr/ , n.
1. Pathol. a sore on the skin or a mucous membrane, accompanied by the disintegration of tissue, the formation of pus, etc.
2. See peptic ulcer .
3. any chronically corrupting or disrupting condition, element, etc.
[ 1350-1400; ME ulcer- (s. of ulcus ); akin to Gk hélkos ]