1. greyback(n = noun.person) johnny, johnny reb, reb, rebel - `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;
is a kind of confederate soldier
2. greyback(n = noun.animal) grayback, limnodromus griseus - a dowitcher with a grey back;
is a kind of dowitcher
3. greyback(n = noun.animal) calidris canutus, grayback, knot - a sandpiper that breeds in the Arctic and winters in the southern hemisphere;
is a kind of sandpiper
is a member of calidris, genus calidris