enamel

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

The verb enamelen developed from the noun once the material and its name had already passed through French and Anglo-Norman hands into English.

It shares its deepest root, Proto-Germanic *smeltaną, with the English word 'smelt' — both point back to the idea of melting metal down.