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Definition of hammerhead:

  1. A fresh- water fish; the stone- roller.
  2. 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.
  3. An African fruit bat ( Hypsignathus monstrosus); - so called from its large blunt nozzle.


knucklehead, loggerhead, dumbass, blockhead, fuckhead, loggerhead turtle, hammerhead shark, dunderhead, bonehead, muttonhead, dunce, numskull, shithead, lunkhead.