Enamel
WordNet
noun
(1) Any smooth glossy coating that resembles ceramic glaze
(2) A paint that dries to a hard glossy finish
(3) Hard white substance covering the crown of a tooth
(4) A colored glassy compound (opaque or partially opaque) that is fused to the surface of metal or glass or pottery for decoration or protection
verb
(5) Coat, inlay, or surface with enamel