Canker

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.

Anything which corrodes, corrupts, or destroy.

A disease incident to trees, causing the bark to rot and fall off.

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.

A kind of wild, worthless rose; the dog-rose.

To affect as a canker; to eat away; to corrode; to consume.

To infect or pollute; to corrupt.

To waste away, grow rusty, or be oxidized, as a mineral.

To be or become diseased, or as if diseased, with canker; to grow corrupt; to become venomous.

an ulceration (especially of the lips or lining of the mouth)