n.[C][U]

1. 【醫】（壞疽性）潰瘍；口瘡
2. （動、植物的）潰瘍病
   His dog has a canker in its ear.

   他的狗的耳朵上有一處潰瘍。

3. 腐敗的原由，弊害
   Is hypocrisy the canker of our society?

   虛偽是我們社會的弊端嗎？

4. 【植】【方】犬薔薇

vt.

1. 使潰瘍
2. 使腐敗

vi.

1. 產生潰瘍
2. 腐敗起來

n.

1. a destructive fungal disease of trees that results in damage to the bark.
   ▸an open lesion in plant tissue caused by infection or injury.
   ▸fungal rot in parsnips, tomatoes, or other vegetables.
2. an ulcerous condition of an animal, especially an inflammation of the ear caused by a mite infestation.
   ▸ (also canker sore) N. Amer. a small ulcer of the mouth or lips.

v.

1. become infected with canker.
2. [usu. as adj. cankered] infect with a corrupting bitterness.