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Define the word a conterbore

"a conterbore" gcide "The Collaborative International Dictionary of English v.0.48"

Countersink \Coun"ter*sink`\, n.
   1. An enlargement of the upper part of a hole, forming a
      cavity or depression for receiving the head of a screw or
      bolt.
      [1913 Webster]

   Note: In the United States a flaring cavity formed by
         chamfering the edges of a round hole is called a
         countersink, while a cylindrical flat-bottomed
         enlargement of the mouth of the hole is usually called
         a conterbore.
         [1913 Webster]

   2. A drill or cutting tool for countersinking holes.
      [1913 Webster]