Twist-drill definition

A drill having deep helical grooves along the shank from the point.
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A kind of drill with deep helical grooves for carrying out chips and shavings.
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A rotating cutting tool, used for cutting holes in rigid materials, that consists of an essentially conical point, relieved and fluted to form cutting lips, and spiral flutes which direct the chips away from the lips and toward ejection from the hole.
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Other Word Forms

Noun

Singular:
twist-drill
Plural:
twist-drills