Word Origin & History
rook (1)
"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.