rookn. Mist; fog. See Roke.()v. i. To squat; to ruck.(Shak.)n.[F. roc (cf. Sp. roque), fr. Per. & Ar. rokh, or rukh, the rook or castle at chess, also the bird roc (in this sense perhaps a different word); cf. Hind. rath a war chariot, the castle at chess, Skr. ratha a car, a war car. Cf. Roll.] (Chess) One of the four pieces placed on the corner squares of the board; a castle.()n.[AS. hrc; akin to OHG. hruoh, ruoh, ruoho, Icel. hrkr, Sw. roka, Dan. raage; cf. Goth. hrukjan to crow.]1. (Zol.) 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.)v. t. & i. To cheat; to defraud by cheating.(Milton.)