Mephistopheles

 Longman Dictionary of Contemporary English Online朗文当代英语 5++LDOCE Online朗文 5++Meph·i·stoph·e·les /ˌmefəˈstɒfəliːz $ -ˈstɑː-/  another name for the devil, especially in the story of Faust —Mephistophelean /ˌmefɪstəˈfiːliən◂/ adjective

Meph·i·stoph·e·lesSyllable  

Mephistopheles
Meph‧i‧stoph‧e‧les /ˌmefəˈstɒfəliːz, ˌmefɪˈstɒfəliːz $ -ˈstɑː-/
another name for the devil, especially in the story of Faust
—Mephistophelean /ˌmefɪstəˈfiːliən◂/ adjective