An eel is a long, thin fish that looks like a snake. Eel is the flesh of this fish which is eaten as food. smoked eel. a long thin fish that looks like a snake and can be eaten. Any of more than 500 fish species (order Anguilliformes) that are slender, elongated, and usually scaleless, with long dorsal and anal fins that are continuous around the tail tip. Eels are found in all seas, from coastal regions to the mid-depths. Freshwater eels are active, predaceous fish with small embedded scales; they grow to maturity in freshwater and return to the sea, where they spawn and die. The transparent young drift to the coast and make their way upstream. Freshwater eels, considered valuable food fish, include species ranging from 4 in. (10 cm) to about 11.5 ft (3.5 m) long. See also moray
voracious snakelike marine or freshwater fishes with smooth slimy usually scaleless skin and having a continuous vertical fin but no ventral fins the fatty flesh of eel; an elongate fish found in fresh water in Europe and America; large eels are usually smoked or pickled