Definition: 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.
Pronunciation: PEP-tik UL-sur
Also Known As: stomach ulcer, Duodenal Ulcer, Gastric Ulcer
