Source : Webster's Revised Unabridged Dictionary (1913)

Water flounder \Wa"ter floun"der\ (Zo["o]l.)
   The windowpane ({Pleuronectes maculatus}). [Local, U. S.]

Windowpane \Win"dow*pane`\, n.
   1. (Arch.) See {Pane}, n., (3)
      b . [In this sense, written also {window pane}.]

   2. (Zo["o]l.) A thin, spotted American turbot ({Pleuronectes
      maculatus}) remarkable for its translucency. It is not
      valued as a food fish. Called also {spotted turbot},
      {daylight}, {spotted sand flounder}, and {water flounder}.