The Collaborative International Dictionary of English v.0.48:

Mimus \Mimus\ prop. n.
   The type genus of the family Mimidae, comprising certain of
   the mockingbirds.

   Syn: genus Mimus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mimus
    n 1: type genus of the family Mimidae: mockingbirds [syn:
         Mimus, genus Mimus]