enamel
noun
[ ɪˈnam(ə)l ]
• an opaque or semi-transparent glossy substance that is a type of glass, applied by vitrification to metallic or other hard surfaces for ornament or as a protective coating.
• "pieces of metalwork decorated with enamel"
• the hard glossy substance that covers the crown of a tooth.
• a paint that dries to give a smooth, hard coat.
• "one coat of enamel and three coats of varnish"
• nail varnish.
enamel
verb
• coat or decorate (a metallic or hard object) with enamel.
• "he enamelled the back of the case in the rococo style"
Origin:
late Middle English (originally as a verb; formerly also as inamel ): from Anglo-Norman French enamailler, from en- ‘in, on’ + amail ‘enamel’, ultimately of Germanic origin.