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From: Webster's Revised Unabridged Dictionary (1913)

 Can·ker n.
 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. Anything which corrodes, corrupts, or destroy.
    The cankers of envy and faction.   --Temple.
 3. Hort. A disease incident to trees, causing the bark to rot and fall off.
 4. Far. 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. A kind of wild, worthless rose; the dog-rose.
 To put down Richard, that sweet lovely rose.
 And plant this thorm, this canker, Bolingbroke.   --Shak.
 Black canker. See under Black.