MESENCEPHALON Meaning of MESENCEPHALON in English mesencephalon BrE AmE ˌmes en ˈkef ə lɒn ˌmez-, ⇨ˌ•eŋ-; -ˈsef- AmE \ -ˈsef ə lɑːn Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012