The term 'of the skull' can be summarized by the word 'cranial, ' which is a seven-letter word. Cranial refers to the skull, which is the bony structure that encloses and protects the brain and other organs of the head in vertebrates. The skull is composed of two parts: the cranium, which is the upper part of the skull, and the facial bones, which form the lower part. The cranium is made up of eight bones that are fused together and form a protective covering for the brain.