The Collaborative International Dictionary of English v.0.48:

Enamel \En*am"el\, v. t. [imp. & p. p. Enameledor Enamelled;
   p. pr. & vb. n. Enameling or Enamelling.]
   1. To lay enamel upon; to decorate with enamel whether inlaid
      or painted.
      [1913 Webster]

   2. To variegate with colors as if with enamel.
      [1913 Webster]

            Oft he [the serpent]bowed
            His turret crest and sleek enameled neck. --Milton.
      [1913 Webster]

   3. To form a glossy surface like enamel upon; as, to enamel
      card paper; to enamel leather or cloth.
      [1913 Webster]

   4. To disguise with cosmetics, as a woman's complexion.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Enamel \En*am"el\, n. [Pref. en- + amel. See Amel, Smelt, v.
   t.]
   1. A variety of glass, used in ornament, to cover a surface,
      as of metal or pottery, and admitting of after decoration
      in color, or used itself for inlaying or application in
      varied colors.
      [1913 Webster]

   2. (Min.) A glassy, opaque bead obtained by the blowpipe.
      [1913 Webster]

   3. That which is enameled; also, any smooth, glossy surface,
      resembling enamel, especially if variegated.
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   4. (Anat.) The intensely hard calcified tissue entering into
      the composition of teeth. It merely covers the exposed
      parts of the teeth of man, but in many animals is
      intermixed in various ways with the dentine and cement.
      [1913 Webster]

   5. Any one of various preparations for giving a smooth,
      glossy surface like that of enamel.
      [Webster 1913 Suppl.]

   6. A cosmetic intended to give the appearance of a smooth and
      beautiful complexion.
      [Webster 1913 Suppl.]

   Enamel painting, painting with enamel colors upon a ground
      of metal, porcelain, or the like, the colors being
      afterwards fixed by fire.

   Enamel paper, paper glazed a metallic coating.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Enamel \En*am"el\, v. i.
   To practice the art of enameling.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Enamel \En*am"el\, a.
   Relating to the art of enameling; as, enamel painting.
   --Tomlinson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enamel
    n 1: hard white substance covering the crown of a tooth [syn:
         enamel, tooth enamel]
    2: a colored glassy compound (opaque or partially opaque) that
       is fused to the surface of metal or glass or pottery for
       decoration or protection
    3: a paint that dries to a hard glossy finish
    4: any smooth glossy coating that resembles ceramic glaze
    v 1: coat, inlay, or surface with enamel

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "enamel":
   apply paint, bedaub, bedizen, begild, besmear, brush on paint,
   butter, calcimine, china, clay, coat, coating, color, complexion,
   cover, dab, daub, deep-dye, dip, distemper, double-dye, dye,
   emblazon, engild, face, facing, fast-dye, film, fresco, fur, gild,
   glaze, gloss, grain, hue, illuminate, imbue, ingrain, japan,
   lacquer, lay on, lay on color, paint, parget, pellicle, pigment,
   porcelain, prime, refractory, revetment, scale, scum, shade,
   shadow, shellac, skin, slap on, slather, slop on paint, smear,
   smear on, spread on, spread with, stain, stipple, tar, tinct,
   tincture, tinge, tint, tone, undercoat, varnish, veneer, wash,
   whitewash