fieldmouse

from WordNet (r) 3.0 (2006)

fieldmouse
    n 1: any nocturnal Old World mouse of the genus Apodemus
         inhabiting woods and fields and gardens [syn: {field
         mouse}, {fieldmouse}]

from The Collaborative International Dictionary of English v.0.48

fieldmouse \fieldmouse\, field mouse \field mouse\n.
   1. (Zool.) any nocturnal Old World mouse of the genus
      {Apodemus} inhabing woods and fields and gardens.
      [WordNet 1.5]

   2. (Zool.) any mouse inhabiting fields, as the {campagnol}
      and the {deer mouse}. See {Campagnol}, and {Deer mouse}.
      [1913 Webster]