glaze /glāz/ [ME, glasen] , 1. v., to cover with a glossy, smooth surface or coating. 2. n., a ceramic veneer added to a dental porcelain restoration after it has been fired, to give a completely nonporous, glossy, or semiglossy surface. 3. n., the final firing (in air) of dental porcelain, when formation of a thin, vitreous, glossy surface takes place.