poster board
or post·er·board
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.
Origin of poster board
First recorded in 1900–05
Words nearby poster board
poste restante,
postelection,
postembryonic,
postemergence,
poster,
poster board,
poster boy,
poster child,
poster color,
poster paint,
posteriad