(of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it; "glazed pottery"; "glassy porcelain"; "hard vitreous china used for plumbing fixtures"
Usually refers to porcelain and stoneware that are fired at a high temperature. The clay begins to become glass-like in nature, although not necessarily waterproof.
Clay that has been glazed and fired for use as clay pipe.