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n. pl. tonguefish or tongue·fish·es
Any of various marine flatfishes of the family Cynoglossidae, having the posterior part of the body tapering to a point.
[From its tongue-shaped body.]
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|Noun||1.||tonguefish - left-eyed marine flatfish whose tail tapers to a point; of little commercial value|
flatfish - 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