Added 9 October 2026 flatfish /ˈflætfɪʃ/ noun Categories: Food & DrinkAnimalsRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about flatfish at Wordnik → Where our words come from → A fish of the order Pleuronectiformes, the adults of which have both eyes on one side and usually swim with the other side down, such as a flounder, a halibut, or a sole. Origin From flat + fish. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: flounderdabsolepleuronectiformplaiceplaiseanglerfishmoonfishplectognathtilefish Back to today's word