CANKER

Definition

1. verb become infected with a canker.
2. verb infect with a canker.
3. noun a fungal disease of woody plants that causes localized damage to the bark.
4. noun an ulceration (especially of the lips or lining of the mouth). — synonyms: canker_sore
5. noun a pernicious and malign influence that is hard to get rid of. — synonyms: pestilence