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Synonyms
can·ker (kănǵkər)

[Middle English, from Old English cancer, and from Old French cancre, both from Latin cancer, crab, malignant disease.]

noun 

  1. Ulceration of the mouth and lips.
  2. An inflammation or infection of the ear and auditory canal, especially in dogs and cats.
  3. A condition in horses similar to but more advanced than thrush.
    1. A localized diseased or necrotic area on a plant part, especially on a trunk, branch, or twig of a woody plant, usually caused by fungi or bacteria.
    2. Any of several diseases of plants characterized by the presence of such lesions.
  4. A source of spreading corruption or decay.

verb: -kered, -ker·ing, -kers. 

transitive verb 

  1. To attack or infect with canker.
  2. To infect with corruption or decay.

intransitive verb 

To become infected with or as if with canker.