Definition of "ulcer" in English

noun

1. (pathology) An open sore of the skin, eyes or mucous membrane, often caused by an initial abrasion and generally maintained by an inflammation and/or an infection.

2. (pathology) Peptic ulcer.

3. (figurative) Anything that festers and corrupts like an open sore; a vice in character.

verb

1. To ulcerate.