hammerhead

noun

1. a stupid person; these words are used to express a low opinion of someone's intelligence

   noun.person

   Synonyms blockhead bonehead dumbass dunce dunderhead fuckhead knucklehead loggerhead lunkhead muttonhead numskull shithead

   Source: WordNet 3.0

2. the striking part of a hammer

   noun.artifact

   Source: WordNet 3.0

3. medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous

   noun.animal

   Synonyms hammerhead shark

   Source: WordNet 3.0

4. A shark of the genus <i>Sphyrna</i> or <i>Zyg&aelig;na</i>, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The <i>Sphyrna zyg&aelig;na</i> is found in the North Atlantic. Called also <i>hammer fish</i>, and <i>balance fish</i>.

   noun

   Source: webster1913