Situated or occurring within the cranium or skull.

Having a very thick skull; exhibiting pachycephaly. Later also (humorous): thickheaded, stupid.

Situated posterior to the cranium.

(a) = pachycephalic, adj.; (b) Zoology of or relating to a former division Pachycephala of crustaceans, comprising the parasitic copepods.

Containing skulls; having skulls about.

applied to that type of skull which includes certain vertebral elements, as in the higher vertebrates.