noun
Any freshwater fish of the order Anguilliformes, which are elongated and resemble snakes.
A European eel (Anguilla anguilla).
Various other animals that resemble true eels, chiefly in shape:
Someone or something that is sneaky and/or hard to catch.
verb
(intransitive) To fish for eels.
(intransitive) To move with a sinuous motion like that of an eel.