noun, plural ex·cur·sus·es, ex·cur·sus.
Examples from the Web for excursus
The subject is complex, and calls for many an excursus and qualifying footnote; yet I think the main outlines are clear enough.Winds Of Doctrine|George Santayana
That would involve an excursus on Irish topography, which would be, to say the least, out of place.
Even the gentle Thackeray—if the excursus may be forgiven—is not wholly free from this failing.Americanisms and Briticisms|Brander Matthews
This is not to say, of course, that the excursus in the second stage has been a loss and a defect.Pagan & Christian Creeds|Edward Carpenter
It is needless to extend further the present excursus on the origin and history of modern pseudo-science.Essays Upon Some Controverted Questions|Thomas H. Huxley