counterbore

Coun"ter*bore` (-br`), 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. Coun`ter*bore" (koun`tr-br"), v. t. Defn: To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.

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