• WordNet 3.6
    • n 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
    • n flatfish sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets
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Webster's Revised Unabridged Dictionary
    • n Flatfish (Zo√∂l) Any fish of the family Pleuronectid√¶; esp., the winter flounder (Pleuronectes Americanus). The flatfishes have the body flattened, swim on the side, and have eyes on one side, as the flounder, turbot, and halibut. See Flounder.
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Century Dictionary and Cyclopedia
    • n flatfish Any fish of the suborder Heterosomata: so called from the flattened bilaterally unsymmetrical form. The body is greatly compressed, and one side is colorless or whitish, while the other is dark and variously marked. The typical flat-fishes constitute the family Pleuronectidœ, and include many species of great economic importance, as the halibut, turbot, plaice, sole, flounder, etc. A flatfish is not reallyflat (that is, depressed or flattened out horizontally), but is, on the contrary, thin (that is, extremely compressed or vertically expanded), and has both eyes on one side, not on top. It swims and lies with its eyeless and colorless side downward, thus appearing as if spread out horizontally.
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In literature:

I said it must have been a flatfish.
"Right Ho, Jeeves" by P. G. Wodehouse
Young Jonson is no flatfish, if he did lay brick; he's a plum worth anybody's picking.
"Master Skylark" by John Bennett
Soles, turbots, and other flatfish are, as is well known, unsymmetrical.
"Darwinism (1889)" by Alfred Russel Wallace
Peter, you're not fond of flatfish, are you, my boy?
"Great Sea Stories" by Various
And I owe you ninepence for that last pair of flatfish you sold me!
"The Adventures of Harry Revel" by Sir Arthur Thomas Quiller-Couch
Saint Petersburg is very ill supplied with salt-water fish; there are neither lobsters nor flatfish.
"Fred Markham in Russia" by W. H. G. Kingston
There I was, caught in a trap, and made a prisoner by a flatfish.
"Peter Simple" by Frederick Marryat
We knew we'd no business to be there and we felt as foolish as flatfish.
"Lucy Maud Montgomery Short Stories, 1907 to 1908" by Lucy Maud Montgomery

In news:

Frog and flatfish, in stages of metamorphosis .
Fun with flatfish on the flats.
Frog and flatfish, in stages of metamorphosis.
With a solid shot of keepers among a multitude of shorts, you'll likely keep a fish or two for dinner while also getting to teach the value of catch-and-release fishing to your flatfish protege.
Flounder are a flatfish species and mostly bottom dwellers although on occasion they come up the water column to feed.
Make no mistake, Calvin Carr of North Pole is happy to have netted $15,000 for winning the Valdez Halibut Derby, but it was a side of tartar sauce compared to what it felt like to reel in the 264-pound flatfish that won him the prize.
Halibut are one of the most prized eating fish around, and California is blessed with two species of these flatfish, the Pacific halibut and the smaller California halibut .
The term " sole " is widely used for many types of flatfish from both the Atlantic and Pacific.