| 1. | any covering for the head, esp. a hat, cap, bonnet, etc. |
| 2. | a protective covering for the head, as a steel helmet or football helmet. |
| 3. | the parts of a harness about the animal's head. |
| 4. | Orthodontics Informal. a device worn on the head and attached by wires and elastic bands to braces in the mouth, used to create backward tension in the process of repositioning protruding teeth. |
| 5. | Mining. a headframe and its machinery. |