1. the outer covering of the teeth

"There are two things in life that a sage must preserve at every sacrifice, the coats of his stomach and the enamel of his teeth."

- Henry Lytton Bulwer (1801 - 1872)

2. a hard, glossy coating or surface, typically smooth and often decorative, made by fusing powdered glass onto a substrate such as metal or pottery

"I love flowers made of glass or gold, true Art's true gifts, their painted hues more beautiful than nature's, worked in nacre and enamel, with perfect leaves and branches."

- C. P. Cavafy (1863 - 1933)