preceptor (n.)youdaoicibaDictYouDict[preceptor 词源字典]
early 15c., "tutor, instructor" (earliest reference might be to "expert in the art of writing"), from Latin praeceptor "teacher, instructor," agent noun from praecipere (see precept). Medical training sense attested from 1803.[preceptor etymology, preceptor origin, 英语词源]