Field mouse Meaning, Definition & Usage

  1. noun 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
    vole.
  2. noun any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens
    fieldmouse.

WordNet

Definitions
  1. (Zoöl.), a mouse inhabiting fields, as the campagnol and the deer mouse. See Campagnol, and Deer mouse.

Webster 1913