Pronunciation: (skul),[key] —n. 1. the bony framework of the head, enclosing the brain and supporting the face; the skeleton of the head.
2. the head as the center of knowledge and understanding; mind: to get literature's great ideas through our skulls. 3. Armor.the part of a helmet that covers the top of the head.
4. out of one's skull,Slang.crazy; demented.