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murine. 1  adj of or relating to or transmitted by a member of the family Muridae (rats and mice) 2  n a rodent that is a member of the family Muridae.
Medical Definition of Mus. : a genus of rodents that is the type of the family Muridae and includes the house mouse (M. musculus) and a few related small forms distinguished by the square-notched tip of the upper incisors as seen in profile.