dux
/dʌks/noun
(pl. Duces /ˈdjuːsiːz/)
1- a Saxon chief or leader（撒克逊人的）首领。
1.1
- chiefly Scottish the top pupil in a school or class〈主苏格兰〉（学校或班级中）成绩最优秀学生。
词源
mid 18th cent. (denoting the leading voice or instrument in a fugue or canon)： from Latin, 'leader'.