macrocephalicEnglishOxford New American Dictionarymacrocephalic /ˌmakrōsəˈfalik, ˌmækroʊsəˈfælɪk / (also macrocephalous /-ˈsefələs/) ▸ adjective Anatomy having an unusually large head. – DERIVATIVES macrocephaly /ˌmakrōˈsefəlē, ˌmækroʊˈsɛfəli / noun