excursus

Etymology
Borrowed from.

Noun

 * 1) A fuller treatment (in a separate section) of a particular part of the text of a book, especially a classic.
 * 2) A narrative digression, especially to discuss a particular issue.

Etymology
Perfect passive participle of.

Participle

 * 1) having been sent forth, hastened towards
 * 2) having been projected, extended

Noun

 * 1) excursion
 * 2) sally, sortie, raid