Source : Webster's Revised Unabridged Dictionary (1913)

Mesocephalic \Mes`o*ce*phal"ic\, a. [Meso- + cephalic.] (Anat.)
   (a) Of or pertaining to, or in the region of, the middle of
       the head; as, the mesocephalic flexure.
   (b) Having the cranial cavity of medium capacity; neither
       megacephalic nor microcephalic.
   (c) Having the ratio of the length to the breadth of the
       cranium a medium one; mesaticephalic.