American Heritage® Dictionary of the English Language, Fourth Edition
- n. A drill having deep helical grooves along the shank from the point.
- n. 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.
GNU Webster's 1913
- n. a drill the body of which is twisted like that of an auger. See
- n. a bit or drill having deep helical grooves
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