|Noun||1.||peptic ulcer - an ulcer of the mucous membrane lining of the alimentary tract|
Synonyms: peptic ulceration
|Pronunciation: (PEP-tik UL-sur)|
A sore in the lining of the esophagus, stomach, or duodenum. Usually caused by the bacterium Helicobacter pylori. An ulcer in the stomach is a gastric ulcer; an ulcer in the duodenum is a duodenal ulcer.