conger
Concise Oxford English Dictionary © 2008 Oxford University Press:
conger /ˈkɒŋgə/ (also conger eel)
▶noun a large edible predatory eel of shallow coastal waters. [Conger conger (Europe), C. oceanica (America), and other species.]
– origin ME: from OFr. congre, via L. from Gk gongros.
'conger' also found in these Oxford entries:

