canker
noun
1. a fungal disease of woody plants that causes localized damage to the bark
Definition categories: state
2. an ulceration (especially of the lips or lining of the mouth)
Definition categories: state, ulcer, ulceration
3. a pernicious and malign influence that is hard to get rid of
- according to him, I was the canker in their midst
Similar word(s): pestilence