A Quick and Simple Dictionary

canker

1. Noun.  (botany) A plant disease marked by gradual decay.
2. Noun.  A corroding or sloughing ulcer; especially a spreading gangrenous ulcer or collection of ulcers in or about the mouth.
3. Noun.  Anything which corrodes, corrupts, or destroys.
4. Noun.  A kind of wild, worthless rose; the dog rose.
5. Noun.  An obstinate and often incurable disease of a horse's foot, characterized by separation of the horny portion and the development of fungoid growths. Usually resulting from neglected thrush.
6. Noun.  An avian disease affecting doves, poultry, parrots but also birds of prey caused by ''Trichomonas gallinae''.
7. Verb.  (transitive) To affect as a canker; to eat away; to corrode; to consume.
8. Verb.  (transitive) To infect or pollute; to corrupt.
9. Verb.  (intransitive) To waste away, grow rusty, or be oxidized, as a mineral.
10. Verb.  To be or become diseased, or as if diseased, with canker; to grow corrupt; to become venomous.