Late 19th century; earliest use found in Journal of the Royal Anthropological Institute. From mesati- + -cephaly, after mesaticephalic, etc. Compare earlier mesaticephalism.
Definition of mesaticephaly in US English:
mesaticephaly
noun
Anthropology rare
The condition of being mesaticephalic.
Origin
Late 19th century; earliest use found in Journal of the Royal Anthropological Institute. From mesati- + -cephaly, after mesaticephalic, etc. Compare earlier mesaticephalism.