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diamond drill

American  

noun

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


Etymology

Origin of diamond drill

First recorded in 1820–30

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

If these tools aren’t enough, you can also use an electric drill with a diamond drill bit.

From Slate • Nov. 8, 2016

To do it, Clinton would need a sharpened hammer or diamond drill, time, and determination.

From Slate • Nov. 8, 2016

More technological advances, including the diamond drill, electric rail and steam shovel, ushered in a new era of industrial-scale lead mining in southeast Missouri.

From MSNBC • Jun. 22, 2016

At week's end, under a crisp, blue sky, a couple of dozen Madelinot workmen stood around with mining engineers and newsmen to watch a diamond drill bite into the cocoa-colored rock.

From Time Magazine Archive

They found, incredibly, the cylindrical core of a diamond drill.

From "The Incredible Journey" by Sheila Burnford