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1. A vitreous, usually opaque, protective or decorative coating baked on metal, glass, or ceramic ware.
2. An object having such a coating, as in a piece of cloisonné.
3. A coating that dries to a hard glossy finish: nail enamel.
4. A paint that dries to a hard glossy finish.
5. Anatomy The hard, calcareous substance covering the exposed portion of a tooth.
tr.v. e·nam·eled, e·nam·el·ing, e·nam·els or e·nam·elled or e·nam·el·ling
1. To coat, inlay, or decorate with enamel.
2. To give a glossy or brilliant surface to.
3. To adorn with a brightly colored surface.

[From Middle English enamelen, to put on enamel, from Anglo-Norman enamailler : en-, on (from Old French; see en-1) + amail, enamel (from Old French esmail, of Germanic origin; see mel- in Indo-European roots).]

e·nam′el·er, e·nam′el·ist n.
References in classic literature ?
A cloud of dark smoke, as from smoldering ruins, went up toward the sun now bright and gay in the blue, enameled sky.
Below them was the Valley of the Missouri, about seven miles in breadth, clad in the fresh verdure of spring; enameled with flowers and interspersed with clumps and groves of noble trees, between which the mighty river poured its turbulent and turbid stream.
On a sill by an open window, a jar of autumn leaves breathed the charm of the sweet brown wife, who seated herself in a tiny rattan chair, enameled a cheery red, such as children delight to rock in.