Etymology
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eel (n.)

Old English æl "eel," from Proto-Germanic *ælaz (source also of Old Frisian -el, Middle Dutch ael, Dutch aal, Old Saxon and Old High German al, German Aal, Old Norse all), which is of unknown origin, with no certain cognates outside Germanic. Used figuratively for slipperiness from at least 1520s.

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Definitions of eel

eel (n.)
the fatty flesh of eel; an elongate fish found in fresh water in Europe and America; large eels are usually smoked or pickled;
eel (n.)
voracious snakelike marine or freshwater fishes with smooth slimy usually scaleless skin and having a continuous vertical fin but no ventral fins;
From wordnet.princeton.edu