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Definition of sidebox
sidebox
/ˈsaɪdˌbɑːks/
side · box
Plural:sideboxes
sidebox Lexical Profile
CEFR
C1
Grade
8
Tier
3
Usage
Rare
• noun
1
A designated area or graphical container positioned on the lateral side of a webpage or software interface, typically used for displaying navigation menus, widgets, or supplementary information.
Example
"The web designer moved the user login form into a sidebox to keep the main reading area clean."
2
A secondary storage compartment or container attached to the exterior side of a vehicle, machine, or larger structure.
Example
"The utility truck was equipped with a locking sidebox where the crew stored their most valuable power tools."
Synonyms
View all synonyms for sidebox• Nearby Words
Word Origin & Etymology
A modern English compound formed from 'side' and 'box', commonly used in software interface design and automotive contexts.
Cite this Entry
Wordmom. (2026). Definition of Sidebox. In Wordmom Dictionary. Retrieved Oct 16, 2026, from https://wordmom.com/dictionary/sidebox