Adjacent Words

countersink definitions

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WordNet (r) 3.0 (2005)

n
1: a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
2: a bit for enlarging the upper part of a hole [syn: counterbore, countersink, countersink bit] v
1: insert (a nail or screw below the surface, as into a countersink) [syn: set, countersink]

Merriam Webster's

I. transitive verb (countersunk; -sinking) Date: 1816 1. to make a countersink on (a hole) 2. to set the head of (as a screw) at or below the surface II. noun Date: 1816 1. a bit or drill for making a funnel-shaped enlargement at the outer end of a drilled hole 2. the enlargement made by a countersink

Oxford Reference Dictionary

v.tr. (past and past part. -sunk) 1 enlarge and bevel (the rim of a hole) so that a screw or bolt can be inserted flush with the surface. 2 sink (a screw etc.) in such a hole.

Webster's 1913 Dictionary

Countersink Coun"ter*sink` (koun"t[~e]r*s[i^][ng]k`; 277), v. t. [imp. & p. p. Countersunk (-s[u^][ng]k`); p. pr. & vb. n. Countersinking.] 1. To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw. 2. To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.

Webster's 1913 Dictionary

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. 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. 2. A drill or cutting tool for countersinking holes.