skull 
(skŭl)
(skŭl)n.
1. The bony or cartilaginous framework that encloses and protects the brain and sense organs of all vertebrates and of one group of nonvertebrates (the hagfishes); cranium.
2. Informal The head, regarded as the seat of thought or intelligence: Use your skull and solve the problem.
3. A death's-head.
[Middle English sculle, probably of Scandinavian origin.]
- autocatalytic plating
- autocephalous
- autocephaly
- autochthon
- autochthonal
- autochthonic
- autochthonism
- autochthonous
- autochthonously
- autochthony
- autoclave
- autocoid
- autocoid
- autocomplete
- autocracy
- autocrat
- autocratic
- autocratically
- autocrine
- autocross
- auto-da-fé
- autodestruct
- autodidact
- autodidactic
- autodyne