That aero-etymological excursus was occasioned by an obituary we carried on Monday.
From the independent.co.uk
The fourteenth-century Legenda Aurea begins each vita of a saint with a fanciful excursus in the form of an etymology.
From the en.wikipedia.org
It does so as a primer rather than as a scholarly excursus, which among other things means that it will be devoid of citations.
From the scoop.co.nz
Is this book, written hectically and in the first person as though spoken by the poet himself, an autobiographical excursus or not?
From the economist.com
But Melampus's own destiny lay in Argos, where he lived and ruled, married and sired a long line, also briefly sketched in Homer's excursus.
From the en.wikipedia.org
The Museum offers a social reconstruction of toys and the act of playing in a series of sections that, through a historic excursus, crosses the fundamental periods of the 20th century.
From the en.wikipedia.org
However, because Heinrich only refers to himself as having written one portion of the poem, an excursus about princely caprice, newer scholarship has abandoned Heinrich as the author of the text.
From the en.wikipedia.org
The latter's technique was to read a passage aloud, which permitted his students to copy it, then to deliver an excursus explaining and illuminating Justinian's text, in the form of glosses.
From the en.wikipedia.org
More examples
Digression: a message that departs from the main subject
An excursus (from Latin excurrere, "to run out of") is a short episode or anecdote in a work of literature . ...
A fuller treatment (in a separate section) of a particular part of the text of a book, especially a classic; A narrative digression, especially to discuss a particular issue
(1) A detailed analysis of a particular point or argument--epecially when added as an appendix at the back of a book. (2) A scholarly digression or an additional discussion.
A detailed discussion appended, such as in an afterword or an appendix.