Which term refers to something pertaining to the skull or cranium?

The term that refers to something pertaining to the skull or cranium is "cranial." This term is derived from the Latin word "cranium," which specifically denotes the bony structure that encases and protects the brain. In medical vocabulary, "cranial" is often used when describing structures, conditions, or procedures that relate directly to the skull.

In contrast, "cerebral" relates to the brain itself and is often used in contexts involving brain functions or conditions affecting the brain, but it does not specifically refer to the skull. "Circular" denotes a shape that is round and has no connection to the skull or cranium. "Coronary" refers to the arteries that supply blood to the heart muscle, and it is not associated with the skull either. Therefore, "cranial" is the appropriate term for anything that pertains to the skull or cranium.