greyback in WordNet English dictionary

1. a sandpiper that breeds in the Arctic and winters in the southern hemisphere
   knot  greyback  grayback  Calidris canutus 
   
2. a dowitcher with a grey back
   greyback  grayback  Limnodromus griseus 
   
3. `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
   Rebel  Reb  Johnny Reb  Johnny  greyback