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diamond drill

a drill having a hollow, cylindrical bit set with diamonds, used for obtaining cores of rock samples.
Origin of diamond drill
1820-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for diamond drill
  • We filled up the hole with all the used-up diamond drill bits and sent a bunch of pipe whistling down the hole.
  • Plug a diamond drill hole that intersects any opening and map the hole.
  • The prime example is the polycrystalline diamond drill bit, now the industry standard for drilling into difficult formations.
  • The diamond drill was not used much in bunchy, having stretches of alternating good and poor ground.

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