LATIN DICTIONARYLexicon Latīnum
nounthird declension

mūs montānus

mūs montānus m (genitive mūris montānī)

Meaning

  1. New Latinmarmot

Declension

declension
formsingularplural
nominativemūs montānusmūrēs montānī
genitivemūris montānīmūrum montānōrum
dativemūrī montānōmūribus montānīs
accusativemūrem montānummūrēs montānōs
ablativemūre montānōmūribus montānīs
vocativemūs montānemūrēs montānī

Origins

Apparently found pre-medievally in the works of Polemius Silvius. The Late and Medieval Latin terms might have been used to describe another animal than that described by later attestations; if so, New Latin mūs montānus might well be a Latinization of a Gallo-Romance form, see Old French marmotte. 16th century alternative forms of French French marmotte (marmontaine et marmotaine murmontaine) are learned folk etymologies based on Latinized mūs montānus.

Quick answers

What does mūs montānus mean in Latin?
mūs montānus, a noun, means “marmot”.
What is the genitive of mūs montānus?
The genitive singular is mūris montānī. mūs montānus is third declension.