From The Collaborative International Dictionary of English v.0.48:

Cossack \Cos"sack\ (k?s"s?k), n. [Russ. kozak', kazak': cf.
   Turk. kaz[=a]k.]
   One of a warlike, pastoral people, skillful as horsemen,
   inhabiting different parts of the Russian empire and
   furnishing valuable contingents of irregular cavalry to its
   armies, those of Little Russia and those of the Don forming
   the principal divisions.
   [1913 Webster]
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