\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.