diamond drill

noun
a drill having a hollow, cylindrical bit set with diamonds, used for obtaining cores of rock samples.

Origin:
1820–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
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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