Etymology
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vole (n.)

1828, short for vole-mouse (1805, in an Orkneys book), literally "field-mouse," with first element probably from Old Norse völlr "field," from Proto-Germanic *walthuz (source also of Icelandic völlr, Swedish vall "field," Old English weald; see wold).

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Definitions of vole

vole (n.)
any of various small mouselike rodents of the family Cricetidae (especially of genus Microtus) having a stout short-tailed body and inconspicuous ears and inhabiting fields or meadows;
Synonyms: field mouse
From wordnet.princeton.edu