\Skim"mer\, n.
1. One who, or that which, skims; esp., a utensil with which
   liquids are skimmed.
2. (Zo["o]l.) Any species of longwinged marine birds of the
   genus {Rhynchops}, allied to the terns, but having the
   lower mandible compressed and much longer than the upper
   one. These birds fly rapidly along the surface of the
   water, with the lower mandible immersed, thus skimming out
   small fishes. The American species ({R. nigra}) is common
   on the southern coasts of the United States. Called also
   {scissorbill}, and {shearbill}.
3. (Zo["o]l.) Any one of several large bivalve shells,
   sometimes used for skimming milk, as the sea clams, and
   large scallops.