Meaning

noun hard white substance covering the crown of a tooth

noun a colored glassy compound (opaque or partially opaque) that is fused to the surface of metal or glass or pottery for decoration or protection

noun a paint that dries to a hard glossy finish

originFrom Middle English enamel, from Anglo-Norman enamailler, from en- (“in-”) + amailler (“to enamel”), variant of Old French esmailler (“to enamel”), from esmal (“enamel”), from Early Medieval Latin smaltum, from Frankish *smalt, from Proto-Germanic *smeltaną (“to melt, smelt”).

Etymology from Wiktionary, CC BY-SA 3.0