twist drill

noun Machinery.
a drill with one or more deep helical grooves in the body.

1870–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
twist drill
a drill bit having two helical grooves running from the point along the shank to clear swarf and cuttings

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Small holes were cut in acrylic with twist drill bits with a dulled cutting edge to prevent chipping.
The cranial bolt is inserted in a twist drill hole in the skull.
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