n. 1. (Zool.) 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. [ 1913 Webster ]

2. (Zool.) A fresh-water fish; the stone-roller. [ 1913 Webster ]

3. (Zool.) An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle. [ 1913 Webster ]