Noun grayback has 3 senses
  1. Rebel, Reb, Johnny Reb, Johnny, grayback - `johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `grayback' derived from their gray Confederate uniforms
    --1 is a kind of Confederate soldier
  2. grayback, Limnodromus griseus - a dowitcher with a gray back
    --2 is a kind of dowitcher
  3. knot, grayback, Calidris canutus - a sandpiper that breeds in the arctic and winters in the southern hemisphere
    --3 is a kind of sandpiper
    --3 is a member of Calidris, genus Calidris
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