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The Collaborative International Dictionary
hammer fish

Hammerhead \Ham"mer*head`\ (-h[e^]d`), n.

  1. (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.

  2. (Zo["o]l.) A fresh-water fish; the stone-roller.

  3. (Zo["o]l.) An African fruit bat ( Hypsignathus monstrosus); -- so called from its large blunt nozzle.