WordWeb Online

1. A fungal disease of woody plants that causes localized damage to the bark
    
2. An ulceration (especially of the lips or lining of the mouth)
   - canker sore
    
3. A pernicious and malign influence that is hard to get rid of
   "according to him, I was the canker in their midst";
   - pestilence

1. Become infected with a canker
    
2. Infect with a canker

Derived forms: cankers, cankering, cankered

Type of: come down, infect, influence, plant disease, sicken, ulcer, ulceration

Encyclopedia: Canker