The Collaborative International Dictionary of English v.0.48:

Skim \Skim\ (sk[i^]m), v. t. [imp. & p. p. Skimmed (sk[i^]md);
   p. pr. & vb. n. Skimming.] [Cf. Sw. skymma to darken.
   [root]158. See Scum.]
   1. To clear (a liquid) from scum or substance floating or
      lying thereon, by means of a utensil that passes just
      beneath the surface; as, to skim milk; to skim broth.
      [1913 Webster]

   2. To take off by skimming; as, to skim cream.
      [1913 Webster]

   3. To pass near the surface of; to brush the surface of; to
      glide swiftly along the surface of.
      [1913 Webster]

            Homer describes Mercury as flinging himself from the
            top of Olympus, and skimming the surface of the
            ocean.                                --Hazlitt.
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   4. Fig.: To read or examine superficially and rapidly, in
      order to cull the principal facts or thoughts; as, to skim
      a book or a newspaper.
      [1913 Webster]

WordNet (r) 3.0 (2006):

skimmed
    adj 1: used of milk and milk products from which the cream has
           been removed; "yogurt made with skim milk"; "she can
           drink skimmed milk but should avoid butter" [syn: skim,
           skimmed]