The Collaborative International Dictionary
balance fish
Hammerhead \Ham"mer*head`\ (-h[e^]d`), n.
(Zo["o]l.) A shark of the genus Sphyrna or Zyg[ae]na, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zyg[ae]na is found in the North Atlantic. Called also hammer fish, and balance fish.
(Zo["o]l.) A fresh-water fish; the stone-roller.
(Zo["o]l.) An African fruit bat ( Hypsignathus monstrosus); -- so called from its large blunt nozzle.