(Science: zoology) A European food fish (Pleuronectes platessa), allied to the flounder, and growing to the weight of eight or ten pounds or more.
A large American flounder (Paralichthys dentatus; called also brail, puckermouth, and summer flounder. The name is sometimes applied to other allied species.
Alternative forms: plaise] Plaice mouth, a mouth like that of a plaice; a small or wry mouth.
Origin: F. Plaise, plais, prob. Fr. L. Platessa flatish, plaice. See Place.