| 1. | Pathology. a sore on the skin or a mucous membrane, accompanied by the disintegration of tissue, the formation of pus, etc. |
| 2. | peptic ulcer. |
| 3. | any chronically corrupting or disrupting condition, element, etc. |

ulcer ul·cer (ŭl'sər)
n.
A lesion of the skin or of 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.
| ulcer (ŭl'sər) Pronunciation Key
A break in the skin or a mucous membrane, such as the one lining the stomach or duodenum, accompanied by inflammation, pus, and loss of tissue. |