The Collaborative International Dictionary of English v.0.48:

Muraena \Mu*rae"na\, n. [L., fr. Gr. ?.] (Zool.)
   A genus of large eels of the family Muraenidae. They differ
   from the common eel in lacking pectoral fins and in having
   the dorsal and anal fins continuous. The murry (Muraena
   Helenae) of Southern Europe was the muraena of the Romans.
   It is highly valued as a food fish.
   [1913 Webster] Muraenoid