noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A box placed alongside the main text in a book, etc. containing further related text.
2. 2
   A box set in the side of a theatre's auditorium.

Synonyms

All synonyms

sidebartext box

Etymology

From side + box; compare sidebar.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.