(1) Muslin or canvas used underneath fine wallpapers to avoid small cracks possibly opening up in a plaster wall and showing through. (2) Fabric that is used to cover inner surfaces, especially when the inner surface is of a different material than the outer. May refer to garment lining, lining for boxes, coffins, etc. Generally of smooth, lustrous appearing fabrics, but also of felt and velvet. Both manufactured fibers and natural fibers are used.