Pachycephaly

Part of speech: noun

Definitions

1. A condition characterized by an abnormally thick or dense skull cap, often resulting in a domed head shape in humans or animals; can refer to the trait seen in certain dinosaur species with thickened cranial bones
2. The state of having a thickened cranial dome caused by excessive growth or development of the skull bones, producing a prominent, rounded head shape seen in some medical conditions and specific prehistoric species
3. Describes the abnormal or evolutionary thickening of the skull's upper portion leading to a rounded or bulbous head appearance in individuals or certain animals known for their thick skull roof structures

Etymology: Pachycephaly is a medical term for an abnormally thick skull, and its parts are both Greek. "Pachy-" comes from the Greek "pakhys," meaning thick, and "-cephaly" comes from "kephalē," meaning head, so the whole word simply means "thick head." The same pattern appears in other skull-shape terms, such as "dolichocephaly" for an unusually long head, built from the same kind of Greek pairing. Because the word is a modern scientific formation assembled from classical roots, it was not used by ancient Greek physicians in this form. Its value lies in precision: the compound pins down the exact feature being described, without the vagueness of everyday phrases about someone being hard-headed.

Synonyms: thick skull