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The Collaborative International Dictionary
Corvus frugilegus

Rook \Rook\, n. [AS. hr[=o]c; akin to OHG. hruoh, ruoh, ruoho, Icel. hr[=o]kr, Sw. roka, Dan. raage; cf. Goth. hrukjan to crow.]

  1. (Zo["o]l.) 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.
    --Wycherley.