Plaice is the common name of three species of flatfishes:

• Alaska plaice, Pleuronectes quadrituberculatus
• American plaice, Hippoglossoides platessoides
• European plaice, Pleuronectes platessa

Plaice can also mean:

• USS Plaice (SS-390), a Balao-class submarine
• PLAICE, an open source hardware FLASH programmer, memory emulator, and logic analyzer

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