Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having a head of medium breadth, with a cephalic index between 76 and 80.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a head that is not particularly short or long from front to back (relative to its width from left to right).
  • n. A mesocephalic person.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to, or in the region of, the middle of the head.
  • adj. Having the cranial cavity of medium capacity; neither megacephalic nor microcephalic.
  • adj. Having the ratio of the length to the breadth of the cranium a medium one; mesaticephalic.

from The Century Dictionary and Cyclopedia

  • In craniometry, of medium size; neither large nor small; with a capacity of from 1,350 to 1,450 cubic centimeters.
  • Having a skull of medium breadth or capacity.
  • Of or relating to the mesencephalon.

Etymologies

From meso- +‎ cephalic, hence literally roughly “medium-headed”. (Wiktionary)

Examples

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