Source : Webster's Revised Unabridged Dictionary (1913)

Skim \Skim\, a.
   Contraction of {Skimming} and {Skimmed}.

   {Skim coat}, the final or finishing coat of plaster.

   {Skim colter}, a colter for paring off the surface of land.
      

   {Skim milk}, skimmed milk; milk from which the cream has been
      taken.

Source : WordNet®

skim milk
     n : milk from which the cream has been skimmed [syn: {skimmed
         milk}] [ant: {whole milk}]