hammerhead Meaning, Definition & Usage

  1. noun a stupid person; these words are used to express a low opinion of someone's intelligence
    bonehead; shithead; dunce; knucklehead; dunderhead; blockhead; fuckhead; dumbass; loggerhead; lunkhead; numskull; muttonhead.
  2. noun the striking part of a hammer
  3. noun medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous
    hammerhead shark.

WordNet

Ham"mer*head` noun
Definitions
  1. (Zoöl.) A shark of the genus Sphyrna or Zygæna, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygæna is found in the North Atlantic. Called also hammer fish, and balance fish.
  2. (Zoöl.) A fresh-water fish; the stone-roller.
  3. (Zoöl.) An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle.

Webster 1913