/ rʊk; NAmE / noun
1.
a large black bird of the crow family. Rooks build their nests in groups at the tops of trees.
2.
= castle (2)
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WORD ORIGIN
sense 1 Old English hrōc , probably imitative and of Germanic origin; related to Dutch roek .
sense 2 Middle English : from Old French rock , based on Arabic ruḵḵ (of which the sense remains uncertain).