Source : Webster's Revised Unabridged Dictionary (1913)

Plaice \Plaice\, n. [F. plaise, plais, prob. fr. L. platessa
   flatish, plaice. See {Place}.] (Zo["o]l.)
   (a) A European food fish ({Pleuronectes platessa}), allied to
       the flounder, and growing to the weight of eight or ten
       pounds or more.
   (b) A large American flounder ({Paralichthys dentatus};
       called also {brail}, {puckermouth}, and {summer
       flounder}. The name is sometimes applied to other allied
       species. [Written also {plaise}.]

   {Plaice mouth}, a mouth like that of a plaice; a small or wry
      mouth. [R.] --B. Jonson.

Source : WordNet®

summer flounder
     n : flounder of eastern coast of North America [syn: {Paralichthys
         dentatus}]