A corroding or sloughing ulcer; esp. a spreading gangrenous ulcer or collection of ulcers in or about the mouth; -- called also water canker, canker of the mouth, and noma.(noun)
source: webster1913
verb (v)
become infected with a canker(verb.body)
source: wordnet30
infect with a canker(verb.body)
source: wordnet30
To affect as a canker; to eat away; to corrode; to consume.(verb)
source: webster1913
To waste away, grow rusty, or be oxidized, as a mineral.(verb)