English
sidebox
From side + box; compare sidebar.
Today it means
noun A box placed alongside the main text in a book, etc. containing further related text.
Sources
Sources: Wiktionary, “sidebox”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / sidebox