Wordnet 3.0
NOUN (1)
1. 
 a rodent that is a member of the family Muridae; 
ADJECTIVE (1)
1. 
 of or relating to or transmitted by a member of the family Muridae (rats and mice); 
- Example: "a murine plague"
The Collaborative International Dictionary of English v.0.48:
Murine \Mu"rine\, a. [L. murinus, from mus, muris, mouse: cf. F.
   murin.] (Zool.)
   Pertaining to a family of rodents (Muridae), of which the
   mouse is the type.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Murine \Mu"rine\, n. (Zool.)
   One of a tribe of rodents, of which the mouse is the type.
   [1913 Webster]
WordNet (r) 3.0 (2006):
murine
    adj 1: of or relating to or transmitted by a member of the
           family Muridae (rats and mice); "a murine plague"
    n 1: a rodent that is a member of the family Muridae