Etymology
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hamster (n.)

c. 1600, from German Hamster, from Middle High German hamastra "hamster," probably from Old Church Slavonic chomestoru "hamster" (the animal is native to southeastern Europe), which is perhaps a blend of Russian chomiak "hamster," and Lithuanian staras "ground squirrel." The older English name for it was German rat.

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Definitions of hamster

hamster (n.)
short-tailed Old World burrowing rodent with large cheek pouches;
From wordnet.princeton.edu