Plywood is the name given to boards made of plies or thin veneers of wood. A log is revolved in a special machine which cuts a continuous "peel" from the surface of the log. This peeling is then cut to the required size, and, when thoroughly dry, two or more plies are cemented together under pressure. In this way any thickness may be made and exceptional widths are possible.
The advantages of plywood are that it is extremely light, has great strength, does not warp or split easily, and can be used in the manufacture of a wide variety of goods, from aeroplanes and paneling to packing-cases. It is said to have been used by the Egyptians in making mummy cases.