1. a large shark with a flattened, hammer-shaped head
Usage: common name for sharks of the genus Sphyrna
2. the head of a hammer; the part of a hammer used for striking
3. a person who is stubborn or foolish
Usage: informal

Examples

• The hammerhead shark uses its wide head to detect electrical signals from prey.
• A hammerhead is one of the most distinctive sharks in the ocean.
• He replaced the broken hammerhead on his old hammer.
• Don't be such a hammerhead—listen to what I'm saying.
• Divers spotted a school of hammerheads near the reef.
• The hammerhead of the tool was made of steel.