Definition of scab noun from the Oxford Advanced American Dictionary

     

    scab

     noun
    noun
    NAmE//skæb//
     
     
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  1. 1[countable] a hard dry covering that forms over a wound as it heals
  2. 2[uncountable] a disease of plants, especially apples and potatoes, that causes a rough surface
  3. 3 [countable] (informal) (disapproving) a worker who refuses to join a strike or takes the place of someone on strike
  4. 4[uncountable] a skin disease of animals

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