ham·mer·head /ˈhæmɚ/
 錘頭;愚笨的人
 Ham·mer·head 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.
 2. Zool. A fresh-water fish; the stone-roller.
 3. Zool. An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle.
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 hammerhead
      n 1: these words are used to express a low opinion of someone's
           intelligence [syn: dunce, dunderhead, numskull, blockhead,
            bonehead, lunkhead, knucklehead, loggerhead, muttonhead,
            shithead, fuckhead]
      2: the striking part of a hammer
      3: medium-sized live-bearing shark with eyes at either end of a
         flattened hammer-shaped head; worldwide in warm waters;
         can be dangerous [syn: hammerhead shark]