Source : Webster's Revised Unabridged Dictionary (1913)

Frosted \Frost"ed\, a.
   Covered with hoarfrost or anything resembling hoarfrost;
   ornamented with frosting; also, frost-bitten; as, a frosted
   cake; frosted glass.

         Frosted work is introduced as a foil or contrast to
         burnished work.                          --Knight.

Source : WordNet®

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