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poster board

or post·er·board

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noun
a thick, fairly stiff cardboard composed of layers of paper or paper pulp compressed together and typically used to support displays.
adjective
of, relating to, or made of poster board.
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Origin of poster board

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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