twist-drill

twist drill

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

Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
twist drill
 
n
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
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