lancetfish(n = noun.animal) lancet fish, wolffish - large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail;
is a kind of malacopterygian, soft-finned fish
is a member of alepisaurus, genus alepisaurus

1.  A large, elongated, scaleless, voracious, deep-sea fish (Alepidosaurus ferox), having long, sharp, lancetlike teeth and a long saillike dorsal fin. [1913 Webster]

2.  The doctor, or surgeon fish. [1913 Webster]