diamond drill

noun

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

Origin of diamond drill

First recorded in 1820–30

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

For commercial work, a diamond drill is often used, but this is scarcely necessary for the occasional work of a laboratory.
A Handbook of Laboratory Glass-Blowing | Bernard D. Bolas
The dangerous reef in the estuary of the Tees is in course of removal by means of the diamond drill.
Chambers's Journal of Popular Literature, Science, and Art | Various
A diamond drill is a most useful adjunct to exploration of a mine or deposit.
The A B C of Mining | Charles A. Bramble
The diamond drill does better work in hard strata than it does in soft.
The A B C of Mining | Charles A. Bramble
"It is a diamond drill, and strikes a bonanza on the lower level," said Carlin.
The Comstock Club | Charles Carroll Goodwin

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