The Collaborative International Dictionary of English v.0.48:

Cutwater \Cut"wa`ter\ (k[u^]t"w[add]`t[~e]r), n. (Naut.)
   1. The fore part of a ship's prow, which cuts the water.
      [1913 Webster]

   2. A starling or other structure attached to the pier of a
      bridge, with an angle or edge directed up stream, in order
      better to resist the action of water, ice, etc.; the
      sharpened upper end of the pier itself.
      [1913 Webster]

   3. (Zool.) A sea bird of the Atlantic (Rhynchops nigra); --
      called also black skimmer, scissorsbill, and
      razorbill. See Skimmer.
      [1913 Webster]