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poster board

or posterboard

noun
1.
a thick, fairly stiff cardboard composed of layers of paper or paper pulp compressed together and typically used to support displays.
adjective
2.
of, relating to, or made of poster board.
Origin of poster board
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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