lancet-fish

from The Century Dictionary.

• noun A fish of the family Teuthididæ or Acanthuridæ, having lancet-like spines, one on each side of the tail. Also called barber-, doctor-, and surgeon-fish.
• noun A fish, Alepidosaurus ferox, of the family Alepidosauridæ, having large lancet-like teeth. See cut under handsaw-fish.