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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Reb
       n 1: `Johnny' was applied as a nickname for Confederate soldiers
            by the Federal soldiers in the American Civil War;
            `greyback' derived from their grey Confederate uniforms
            [syn: Rebel, Reb, Johnny Reb, Johnny, greyback]