Etymology
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flatfish (n.)

also flat-fish, 1710, from flat (adj.) + fish (n.). So called from the shape.

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Definitions of flatfish

flatfish (n.)
sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets;
flatfish (n.)
any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side;
From wordnet.princeton.edu