mesocephalicPronunciation: /ˌmɛsə(ʊ)sɪˈfalɪk, ˌmɛz-, ˌmiːs-, ˌmiːz-, -kɛ-/Definition of mesocephalic adjective Anatomy having a head of medium proportions, not markedly brachycephalic or dolichocephalic. mesocephalic in other Oxford dictionaries Definition of mesocephalic in the US English dictionary