The Collaborative International Dictionary of English v.0.48:

Mullet \Mul"let\, n. [OE. molet, mulet, F. mulet, fr. L.
   mullus.]
   1. (Zool.) Any one of numerous fishes of the genus Mugil; --
      called also gray mullets. They are found on the coasts
      of both continents, and are highly esteemed as food. Among
      the most valuable species are Mugil capito of Europe,
      and Mugil cephalus which occurs both on the European and
      American coasts.
      [1913 Webster]

   2. (Zool.) Any species of the genus Mullus, or family
      Mullidae; called also red mullet, and surmullet,
      esp. the plain surmullet (Mullus barbatus), and the
      striped surmullet (Mullus surmulletus) of Southern
      Europe. The former is the mullet of the Romans. It is
      noted for the brilliancy of its colors. See Surmullet.
      [1913 Webster]

   French mullet. See Ladyfish
      (a) .
          [1913 Webster]