Hammerhead

·noun A fresh-water fish; the stone-roller.

II. Hammerhead ·noun An African fruit bat (Hypsignathus monstrosus);

— so called from its large blunt nozzle.

III. Hammerhead ·noun A shark of the genus Sphyrna or Zygaena, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygaena is found in the North Atlantic. Called also hammer fish, and balance fish.