<p><strong>noun</strong></p><ul><li>Plural (especially collectively) flatfish, (especially referring to two or more kinds or species) flatfishes.</li><li>Any fish of the order Heterosomata (Pleuronectiformes), including the halibut, sole, flounder, etc., having a greatly compressed body and swimming on one side, with both eyes on the upper side in the adult.</li></ul><p><strong>End of Response</strong></p>