Webster's English Dictionary

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scab

1. scab \'skab\ n [ME, of Scand origin; akin to OSw skabbr scab; akin to OE 
   sceabb sc]ab, L scabies mange, scabere to scratch - more at SHAVE 1: 
   scabies of domestic animals  2: a crust of hardened blood and serum over a 
   wound  3a: a contemptible person  3b1: one who refuses to join a labor 
   union  3b2: a union member who refuses to strike or returns to work before 
   a strik e has ended 3b3: a worker who accepts employment or replaces a 
   union worker during a st rike 3b4: one who works for less than union wages 
   or on nonunion terms  4: any of various bacterial or fungous diseases of 
   plants characterized by  crustaceous spots; also : one of the spots
2. scab vi or scabbed;  or scab.bing 1: to become covered with a scab  2: 
   to act as a scab