noun (plural ~es; also ~) Etymology: Latin, digression, from excurrere Date: 1803 an appendix or digression that contains further exposition of some point or topic
EXCURSUS
Meaning of EXCURSUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012