- [uncountable]
a disease that destroys the wood of plants and trees （植物和树木的）溃疡病，枝枯病 Cut out lesions on branches caused by canker. 切除由溃疡病引起的树枝上的病变。
- [countable]
a damaged area in a plant or tree caused by disease or injury 溃疡病： 由于疾病或伤害造成的植物或树木受损区域Check trees for cankers. 检查树木有无腐烂物。
- (also canker sore (both North American English), British English mouth ulcer)
a small painful area in the mouth 口腔溃疡 - [uncountable]
a disease that causes painful areas in the ears of animals, especially dogs and cats （尤指猫狗耳部的）溃疡，痈，疮 - [countable] (literary)
an evil or dangerous influence that spreads and affects people’s behaviour （蔓延并影响人的行为的）邪恶，祸害，祸患，腐败
Word OriginMiddle English (denoting a tumour): from Old French chancre, from Latin cancer ‘crab’ (see cancer).