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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Coun·ter·bore v. t. To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
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From: Webster's Revised Unabridged Dictionary (1913)

 Coun·ter·bore n.
 1. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
 2. A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.

From: WordNet (r) 2.0

 counterbore
      n : a bit for enlarging the upper part of a hole [syn: countersink,
           countersink bit]