'a conterbore' definitions:

Definition of 'a conterbore'

From: GCIDE
  • 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]