society > occupation and work > materials > raw material > stone or rock > [noun] > building stone > for roofing (8)
a thin flat stone (e.g. Stonesfield slate) used for roofing.
Chiefly Scottish. Stone used to construct a roof or roof ridge.
Geology. Any laminated flagstone, splitting into layers thicker than slate, suitable for roofing tiles; spec. a group of sandstones forming the…