1. Any of various long, snakelike, scaleless marine or freshwater fishes of the order Anguilliformes or Apodes that lack pelvic fins and characteristically migrate from fresh water to salt water to spawn.
2. Any of several similar fishes, such as the lamprey and electric eel.
Sentence Example with eel
The New Zealand longfin eel, is one of the most important creatures in the faith of the New Zealand Maori, and one of the longest-lived and largest freshwater fishes in the world (they can grown seven feet long, and have been aged at 104 years).