Source : Webster's Revised Unabridged Dictionary (1913)

Mus \Mus\, n.; pl. {Mures}. [L., a mouse.] (Zo["o]l.)
   A genus of small rodents, including the common mouse and rat.

Source : WordNet®

Mus
     n : type genus of the Muridae: common house mice; upper incisors
         have a square-notched tip [syn: {genus Mus}]