Definition: mus

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Source: WordNet (r) 1.7 

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

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.