Edison Electric Institute
Merriam-Webster Online Dictionary
eel (noun)1.
a) any of numerous voracious elongate snakelike bony fishes (order Anguilliformes) that have a smooth slimy skin, lack pelvic fins, and have the median fins confluent around the tail - compare american eel
b) any of numerous other elongate fishes (as of the order Synbranchiformes)
2.
any of various nematodes (as the vinegar eel)