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Definition of canker:

  1. 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.
  2. A disease incident to trees, causing the bark to rot and fall off.
  3. A kind of wild, worthless rose; the dog- rose.
  4. 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.
  5. Anything which corrodes, corrupts, or destroy.
  6. To affect as a canker; to eat away; to corrode; to consume.
  7. To be or become diseased, or as if diseased, with canker; to grow corrupt; to become venomous.
  8. To infect or pollute; to corrupt.
  9. To waste away, grow rusty, or be oxidized, as a mineral.


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