mesocephalic Syllabification: (mes·o·ce·phal·ic)Pronunciation: /ˈmezəsəˈfalik, ˌmē-/Definition of mesocephalic adjective Anatomy having a head of medium proportions, not markedly brachycephalic or dolichocephalic. Derivatives mesocephalyPronunciation: /-ˈsefəlē/ noun mesocephalic in other Oxford dictionaries Definition of mesocephalic in the British & World English dictionary