Illustration of conger eel
conger eel
noun
con·ger eel ˈkäŋ-gər- 
: a large strictly marine scaleless eel (Conger oceanicus) of the Atlantic
broadly : any of various related eels (family Congridae)
Word History
Etymology
Middle English congre, from Anglo-French, from Latin congr-, conger, probably from Greek gongros
First Known Use
1602, in the meaning defined above