excursus
/ekˈskɜːsəs/noun
(复同单, 或excursuses)
1- a detailed discussion of a particular point in a book, usually in an appendix附记; 附注; 附录; 补论。
1.1
- a digression in a written text离题话。
词源
early 19th cent.: from Latin, excursion, from excurrere 'run out'.