The Collaborative International Dictionary of English v.0.48:

Frost \Frost\, v. t. [imp. & p. p. Frosted; p. pr. & vb. n.
   Frosting.]
   1. To injure by frost; to freeze, as plants.
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   2. To cover with hoarfrost; to produce a surface resembling
      frost upon, as upon cake, metals, or glass; as, glass may
      be frosted by exposure to hydrofluoric acid.
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            While with a hoary light she frosts the ground.
                                                  --Wordsworth.
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   3. To roughen or sharpen, as the nail heads or calks of
      horseshoes, so as to fit them for frosty weather.
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The Collaborative International Dictionary of English v.0.48:

Frosted \Frost"ed\, a.
   1. Covered with hoarfrost or anything resembling hoarfrost;
      ornamented with frosting; also, frost-bitten; as, a
      frosted cake; frosted donuts.
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   2. Provided with a surface finish which is matte or with a
      very fine grain, reminiscent of the surface texture of
      frost; as, frosted glass. Opposed to polished or
      burnished.
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            Frosted work is introduced as a foil or contrast to
            burnished work.                       --Knight.
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WordNet (r) 3.0 (2006):

frosted
    adj 1: (of glass) having a roughened coating resembling frost;
           "frosted glass"