prefect
noun [ C ] uk/ˈpriː.fekt/ us/ˈpriː.fekt/
(OFFICIAL)
（某些国家的）地方行政长官，警察局长
(in some countries) a very important official in the government or the police
He has been appointed Prefect of Bologna. 他被任命为博洛尼亚地方行政长官。
(STUDENT)
（英国和澳大利亚某些学校中的）学长
(in some British and Australian schools) an older student who is given some authority and helps to control the younger students