Noun hammerhead has 3 senses
  1. dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, fuckhead - these words are used to express a low opinion of someone's intelligence
    --1 is a kind of simpleton, simple
  2. hammerhead - the striking part of a hammer
    --2 is a kind of
    head
    --2 is a part of hammer
    --2 has part: peen
  3. hammerhead, hammerhead shark - medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous
    --3 is a kind of shark
    --3 is a member of Sphyrna, genus Sphyrna
    --3 has particulars:
     smooth hammerhead, Sphyrna zygaena; smalleye hammerhead, Sphyrna tudes; shovelhead, bonnethead, bonnet shark, Sphyrna tiburo
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