Word of the day
Given my weakness for footnotes, I can see me using this one I picked up while reading a review of an SF novel quite a bit…
EXCURSUS noun | formal
a detailed discussion or explanation of a subject, which is separate from the main subject that is being written or talked about:
Before discussing this a short historical excursus will be necessary to explain how it all came about.
The case histories include an 11-page excursus on Latin.