\Rough"leg`\, n. (Zo["o]l.)
Any one of several species of large hawks of the genus
{Archibuteo}, having the legs feathered to the toes. Called
also {rough-legged hawk}, and {rough-legged buzzard}.
Note: The best known species is {Archibuteo lagopus} of
      Northern Europe, with its darker American variety
      ({Sancti-johannis}). The latter is often nearly or
      quite black. The ferruginous roughleg ({Archibuteo
      ferrugineus}) inhabits Western North America.