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canker

noun
🔊/ˈkæŋkə(r)/
🔊/ˈkæŋkər/
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  1. [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.切除因溃疡引起的分支病变。
  2. [countable] a damaged area in a plant or tree caused by disease or injury
    • Check trees for cankers.检查树木是否有溃疡。
  3. (also canker sore (both North American English), British English mouth ulcer)
     a small painful area in the mouth 口腔溃疡
  4. [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
  5. [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Topics Dangerc2
    6. Word OriginMiddle English (denoting a tumour): from Old French chancre, from Latin cancer ‘crab’ (see cancer).