n. 1 any of various snakelike fish, with slender body and poorly developed fins. 2 a slippery or evasive person or thing. eel-grass 1 any marine plant of the genus Zostera, with long ribbon-like leaves. 2 any submerged freshwater plant of the genus Vallisneria. eel-like adj. eely adj.
[ OE l f. Gmc ]