in anatomy, an assemblage of several bones which cover and enclose the brain and cerebellum, popularly called the skull. See ANATOMY, Cranekno II. The word comes from the Greek κρανίον, of κράνος, galea, "helmet," because it serves to defend the brain like a head-piece. Pezron, again, derives κρανίον from the Celtic cren, because of its roundness.