Rook, n.
 1. Zool. A European bird (Corvus frugilegus) resembling the crow, but smaller. It is black, with purple and violet reflections. The base of the beak and the region around it are covered with a rough, scabrous skin, which in old birds is whitish. It is gregarious in its habits. The name is also applied to related Asiatic species.
    The rook . . . should be treated as the farmer's friend.   --Pennant.
 2. A trickish, rapacious fellow; a cheat; a sharper.


 Corvus frugilegus
      n : common gregarious Old World bird about the size and color of
          the American crow [syn: rook]