Definition of ulcer noun from the Oxford Advanced Learner's Dictionary

 

ulcer

 noun
noun
BrE BrE//ˈʌlsə(r)//
 
; NAmE NAmE//ˈʌlsər//
 
 
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a sore area on the outside of the body or on the surface of an organ inside the body which is painful and may bleed or produce a poisonous substance a stomach ulcer There is a family history of gastric ulcer disease. a mouth ulcer see also mouth ulcer Word Origin late Middle English: from Latin ulcus, ulcer-.
See the Oxford Advanced American Dictionary entry: ulcer