Source : Webster's Revised Unabridged Dictionary (1913)

Mummichog \Mum"mi*chog\, n. [Amer. Indian name.] (Zo["o]l.)
   Any one of several species of small American cyprinodont
   fishes of the genus {Fundulus}, and of allied genera; the
   killifishes; -- called also {minnow}. [Written also
   {mummychog}, {mummachog}.]

Source : WordNet®

mummichog
     n : silver-and-black killifish of saltwater marshes along the
         Atlantic coast of the United States [syn: {Fundulus
         heteroclitus}]