Dictionary
ex•cur•sus
Pronunciation: (ek-skûr'sus), [key]—
n.,
—pl. -sus•es, -sus.
1. a detailed discussion of some point in a book, esp. one added as an appendix.
2. a digression or incidental excursion, as in a narrative.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.