canker

can·ker

noun \ˈkaŋ-kər\

Definition of CANKER

1

a (1) : an erosive or spreading sore (2) obsolete : gangrene b : canker sore

2

a : a chronic inflammation of the ear in dogs, cats, or rabbits; especially : a localized form of mange b : a chronic and progressive inflammation of the deep horn-producing tissues of the frog and sole of the hooves of horses resulting in softening and destruction of the horny layers