a slime-coated, eel-like siren salamander ( Siren lacertina ) with no hind legs, two short front legs, internal lungs , and external gills : it lives in swamps , ditches , and ponds , in the SE U.S.

the conger eel ; Anguilla anguilla

an aquatic salamander , Amphiuma means, having an eel-like body with gill slits and rudimentary limbs and inhabiting still , muddy waters in the southern US: family Amphiumidae

elver

a large, predatory , eel-like fish, of the Muraenidae family, esp Muraena helena

any silvery eel-like marine spiny-finned fish of the family Ammodytidae found burrowing in sand or shingle

any deep-sea eel-like fish of the genera Eurypharynx and Saccopharynx and order Lyomeri, having the ability to swallow large prey

→ lamprey

a nematode worm , Anguillula aceti, that feeds on the organisms that cause fermentation in vinegar and other liquids

any of a family (Congridae, order Anguilliformes) of large saltwater eels , with a long dorsal fin , sharp teeth, and powerful jaws ; esp., any of an edible genus ( Conger ) of eels

an eel-like freshwater cyprinoid fish, Electrophorus electricus, of N South America , having electric organs in the body: family Electrophoridae

any of a family (Anguillidae) of eels that live in streams , lakes, etc. and migrate to the sea to spawn

a large species of sand eel , Hyperoplus lanceolatus

any voracious marine coastal eel of the family Muraenidae, esp Muraena helena , marked with brilliant patterns and colours

used to describe someone whom it is very difficult to catch, or from whom it is very difficult to get the information that you want