The Collaborative International Dictionary
puckermouth
Plaice \Plaice\, n. [F. plaise, plais, prob. fr. L. platessa flatish, plaice. See Place.] (Zo["o]l.)
A European food fish ( Pleuronectes platessa), allied to the flounder, and growing to the weight of eight or ten pounds or more.
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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.