mass noun
1
- a necrotic fungal disease of apple and other trees that results in damage to the bark（苹果等树的）溃疡病。
1.1
- count noun an open lesion in plant tissue caused by infection or injury（因感染或损伤而引起的）植物组织溃疡。
1.2
- fungal rot in some fruits and vegetables, e.g. parsnips and tomatoes（欧洲萝卜、西红柿等水果、蔬菜的）真菌腐烂。
2
- Medicine an ulcerous condition or disease, in particular【医】溃疡, 尤指：
2.1
- （亦作canker sore）chiefly US a small ulcer of the mouth or lips〈主美〉口疮。
2.3
- ulceration of the throat and other orifices of birds, typically caused by a protozoal infection（尤指因原生动物感染而引起的）鸟喉（或其他体孔）溃疡。
2.4
- （亦作ear canker）inflammation of the ear of a dog, cat, or rabbit, typically caused by a mite infestation耳溃疡（尤指因螨虫感染而引起的狗、猫或兔外耳道炎症）。
2.5
- figurative a malign and corrupting influence that is difficult to eradicate〈喻〉恶痈, 恶疽：
in sing. racism remains a canker at the heart of the nation.种族主义仍是该国的心腹毒瘤。
1
- no obj.(of woody plant tissue) become infected with canker（木本植物组织）感染溃疡; 溃烂：
as noun cankering we found some cankering of the wood.我们发现这木材有些溃烂现象。
2
- with obj. [usu. as adj. cankered] infect with a pervasive and corrupting bitterness腐蚀, 败坏：
he hated her with a cankered, shameful abhorrence.
他恶毒而可耻地憎恶她。
派生词
cankerous
adjective词源
Middle English (denoting a tumour)： from Old French chancre, from Latin cancer 'crab' （see CANCER）.