Skull (noun)

1. The bony framework of the head, enclosing the brain and supporting the face.
2. The skull of a person or animal, used as a symbol of death or danger.
3. A person's head or brain.

Origin:

Old english scolu, of germanic origin; related to dutch schedel and german schädel.

Examples:

1. He examined the skull.
2. The skull of a dinosaur.
3. The skull and crossbones is a symbol of poison.
4. He hit him on the skull.
5. The skull is the upper part of the skeleton.