scaleboard

Century Dictionary and Cyclopedia

1. n. A very thin board, such as is used for the back of a picture or a looking-glass.
2. n. In printing, a thin strip of wood, less than type-high, formerly used around pages of type to aid in getting exact margins and register. Cardboard is now used for this purpose.

Wiktionary

1. n. obsolete, printing A thin slip of wood used to justify a page.
2. n. obsolete A thin veneer or leaf of wood used for covering the surface of articles of furniture etc.

GNU Webster's 1913

1. n. (Print.), obsolete A thin slip of wood used to justify a page.
2. n. A thin veneer of leaf of wood used for covering the surface of articles of furniture, and the like.