• The portion of a hammer containing the metal striking face (also including the claw or peen if so equipped).
  • (zoology) An African fruit bat, the hammer-headed fruit bat, Hypsignathus monstrosus, so called from its large blunt nozzle.
  • (zoology) A fresh-water fish; the stone-roller, in the minnow family Cyprinidae.
  • (biology) A kind of ribozyme; hammerhead ribozyme.
  • (zoology) Any of various sharks of the genus Sphyrna or Zygaena having the eyes set on projections from the sides of the head, which gives it a hammer shape.
  • (slang) A stupid person, a dunce.

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