[[wiki-architecture]] · [[Building Materials]] · [[ARCHITECTURE]] · [[000]] # Ply (layer) A ply is a layer of material which has been combined with other layers in order to provide strength. The number of layers is indicated by prefixing a number, for example 4-ply, indicating material composed of 4 layers. == Etymology == The word "ply" derives from the French verb plier, "to fold", from the Latin verb plico, from the ancient Greek verb πλέκω. == Examples == Yarn, where plying is a spinning technique to combine several fibres. Vehicle tires Plywood Toilet paper == References ==