This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A coarse yellow cardboard made of straw pulp.

n. A form of cardboard, usually yellow, made from straw

n. Pasteboard made of pulp of straw.

n. A thick and coarse hard-rolled fabric of yellow paper or cardboard made of straw: largely used by makers of cheap paper boxes.

n. a coarse yellow cardboard made of straw pulp

"The latter is sometimes called strawboard, because it is made from wheat straw, and where it is manufactured, uses a large amount of straw that would otherwise be wasted, but the great wheat fields of the West still have immense quantities of unused straw, which, if made into strawboard, would not only bring more prosperity to that region but would lessen the drain on the forests."

composition board    cardboard