skull Definition

skull
noun

1. In vertebrates: the hard cartilaginous or bony framework of the head, including the cranium (which encloses the brain), face and jaws.
2. colloq, often derog
The head or brain; intelligence
Example: Can't you get it through your thick skull?
3. A skullcap, especially one made of metal.

Idiom: out of one's skull

Mad or crazy.

Extremely drunk.

Etymology: 13c as scolle: from Norse skalli.