[ek-skur-suh s]
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noun, plural ex·cur·sus·es, ex·cur·sus.
  1. a detailed discussion of some point in a book, especially one added as an appendix.
  2. a digression or incidental excursion, as in a narrative.

Origin of excursus

1795–1805; < Latin: a running out, sally, digression, derivative of excurrere to run out. See ex-1, course
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for excursus


noun plural -suses or -sus
  1. an incidental digression from the main topic under discussion or from the main story in a narrative

Word Origin for excursus

C19: from Latin: a running forth, from excurrere to run out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012