1) Cardboard 2) Composition board 
• (n.) Pasteboard made of pulp of straw.
A thicker board made from straw pulp, used in bookwork and in the making of envelopes and cartons. 
Straw'board` noun Pasteboard made of pulp of straw. 
Strawboard is a variety of cardboard made mainly of straw which has been boiled in lime or soda to soten it. Strawboard was once used for making boxes and for packaging.
[n] - a coarse yellow cardboard made of straw pulp
Board made from straw pulp. Used principally for case book covers, cheap account books and rigid box-making. Not readily available nowadays.
noun a coarse yellow cardboard made of straw pulp
coarse, yellow paperboard made of straw pulp, used in packing, for making boxes, etc.