- eel [ēl]n.pl. eels or eel [ME ele < OE æl, akin to Ger aal]1. any of an order (Anguilliformes) of bony fishes with long, slippery, snakelike bodies and no pelvic fins2. any of various other snakelike fishes, including the electric eel and lampreyeely [ēl′ē]adj.
English World dictionary. V. Neufeldt. 2014.