MEANING: noun:
1. A detailed discussion about a particular point, especially when added as an appendix.
2. A digression.

ETYMOLOGY: From Latin excurrere (to run out), from ex- (out) + currere (to run). Ultimately from the Indo-European root kers- (to run), which also gave us car, career, carpenter, occur, discharge, caricature, au courant, concur, cark, discursive, and succor. Earliest documented use: 1803.

EXCURCUS - Ringling Bros. Barnum and Bauley, after they close a couple of months from now

LEXCURSUS - Luthor has a few unpleasant things to say about Superman

ENC: URSUS - along with this letter please find one bear