campagnol
Webster's Dictionary (GCIDE)
Campagnol \Cam`pa`gnol"\, n. [F., fr. campagne field.] (Zool.) A mouse (Arvicala agrestis), called also meadow mouse, which often does great damage in fields and gardens, by feeding on roots and seeds. [1913 Webster]
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]