A thick, single-ply, low-quality grade of cardboard commonly used as a backboard in the gluing together of a pad of paper (or padding). Chip board is gray or brown in color, and is highly moisture-absorbent. It is commonly produced from wastepaper and is used in applications where increased strength and quality are not required. Chipboard is also used in lieu of binder's board for the covers of inexpensive books. Also spelled as one word, chipboard.