The definition of mesocephalic is having a medium-sized head with a width measuring 76 to 81% of its length in males and 75 to 83% of its length in females.(adjective)
A man with a head width that measures 80% of its length is an example of a man's head that would be described as mesocephalic.
See mesocephalic in Webster's New World College Dictionary
Origin: meso- + cephalic
See mesocephalic in American Heritage Dictionary 4
Learn more about mesocephalic