Main entry: pestilence, canker
Definition: a pernicious and malign influence that is hard to get rid of
Usage: racism is a pestilence at the heart of the nation; according to him, I was the canker in their midst
Main entry: canker, canker sore
Definition: an ulceration (especially of the lips or lining of the mouth)
Main entry: canker
Definition: a fungal disease of woody plants that causes localized damage to the bark
Main entry: canker
Definition: infect with a canker
Main entry: canker
Definition: become infected with a canker