The Collaborative International Dictionary of English v.0.48:

Mugil \Mu"gil\, prop. n. [L., a sort of fish.] (Zool.)
   A genus of fishes including the gray mullets. See Mullet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Mugil
    n 1: type genus of the Mugilidae: mullets [syn: Mugil, genus
         Mugil]