Meanings
nounposterboard (countable and uncountable, plural posterboards)
plural posterboards
- uncountableCardboard material suitable for making posters.
I used a piece of posterboard for my project.
- countableuncountableA piece of such material.
I used the posterboard for my project.
- countabledirectuncountablebusinessA flyer printed on stiff cardboard, approximately 8.5 by 11 inches, mailed flat.
They sent me a nice posterboard on the new product.
Synonyms & antonyms
nouna cardboard suitable for making posters
Similar
paperboardposter board
Broader
cardboardcomposition board
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Cite this entry
APA
posterboard. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/posterboard
MLA
“posterboard.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/posterboard. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “posterboard,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/posterboard.
Source: posterboard on Wiktionary, CC BY-SA 4.0.