field_mouse has definitions from the field of zoology
1
[ noun ] (zoology) 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

vole

2
[ noun ] (zoology) any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens

Synonyms

fieldmouse

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