Plywood is a term generally used to designate glued wood panels made up of layers, or plies, with the grain of one or more layers at an angle, usually 90 , with the grain of the other. The outside plies are called faces or face and back, the center plies are called the core, and the plies immediately below the face and back, laid at right angles to them, are called the crossbands.
Plywood is an outgrowth of the laminated wood known as veneer, which consists of an outside sheet of hardwood glued to a base of lower-cost wood.
