megacephaly in British English
(ˌmɛɡəˈsɛfəlɪ) or megalocephaly
nounthe condition of having an unusually large head or cranial capacity. It can be of congenital origin or result from an abnormal overgrowth of the facial bones
Compare microcephaly Derived forms
megacephalic (ˌmɛɡəsɪˈfælɪk), megacephalous (ˌmegaˈcephalous) or megalocephalic (ˌmegaloceˈphalic) or megalocephalous (ˌmegaloˈcephalous) adjective