Polack (n.)

"Polish person," 1570s, from Polish Polak "(male) Polish person," related to Polanie "Poles," Polska "Poland," polski "Polish" (see Pole). By 1834 as a term for Polish Jews (distinguished from Litvak). In North American usage, "Polish immigrant, person of Polish descent" (1879) and in that context considered offensive in English. As an adjective from c. 1600.

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Definitions of Polack from WordNet

polack (n.)
a person of Polish descent;