Definition of scab noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//skæb//
    ; NAmE NAmE//skæb//
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  1. 1[countable] a hard dry covering that forms over a wound as it heals See related entries: Injuries
  2. 2 [uncountable] a skin disease of animals
  3. 3 [uncountable] a disease of plants, especially apples and potatoes, that causes a rough surface
  4. 4[countable] (informal, disapproving) a worker who refuses to join a strike or takes the place of somebody on strike synonym blackleg
  5. Word OriginMiddle English (as a noun): from Old Norse skabb; related to dialect shab (compare with shabby). The sense ‘contemptible person’ (dating from the late 16th cent.) was probably influenced by Middle Dutch schabbe ‘slut’.