1 [rook]
a black, European crow, Corvus frugilegus, noted for its gregarious habits.
a sharper at cards or dice; swindler.
verb (used with object)
to cheat; fleece; swindle.

before 900; Middle English rok(e), Old English hrōc; cognate with Old Norse hrōkr, Old High German hruoh Unabridged


2 [rook]
noun Chess.
one of two pieces of the same color that may be moved any number of unobstructed squares horizontally or vertically; castle.

1300–50; Middle English rok < Old French roc < Arabic rukhkh < Persian rukh Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rook1 (rʊk)
1.  a large Eurasian passerine bird, Corvus frugilegus, with a black plumage and a whitish base to its bill: family Corvidae (crows)
2.  slang a swindler or cheat, esp one who cheats at cards
3.  slang (tr) to overcharge, swindle, or cheat
[Old English hrōc; related to Old High German hruoh, Old Norse hrōkr]

rook2 (rʊk)
Also called: castle a chesspiece that may move any number of unoccupied squares in a straight line, horizontally or vertically
[C14: from Old French rok, ultimately from Arabic rukhkh]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"European crow," O.E. hroc, from P.Gmc. *khrokaz (cf. O.N. hrokr, M.Du. roec, M.Swed. roka, O.H.G. hruoh), possibly imitative of its raucous voice. Used as a disparaging term for persons since at least 1508, and extended by 1577 to mean "a cheat," especially at cards or dice. The verb "to defraud by
cheating" (originally especially in a game) is first attested 1590. Rookery "colony of rooks" is from 1725.

"chess piece," c.1300, from O.Fr. roc, from Ar. rukhkh, from Pers. rukh, of unknown meaning, perhaps somehow related to the Indian name for the piece, rut, from Hindi rath "chariot." Confused in M.E. with roc (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Although rooks are social birds, they are monogamous and mate for life, making for a relatively stable adult rook society.
Two friends, a rook and crow were to be in charge of the fund.
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