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diamond drill

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noun

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

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Nearby words

Origin of diamond drill

First recorded in 1820–30

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diamond drill

In the river wash-borings were made from a floating pile-driver on which was installed a diamond-drill outfit of rods, pump, etc.
Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910|Charles M. Jacobs
The man who can bore into the basalt of that mass must have a diamond-drill.
The Life and Letters of Lafcadio Hearn, Volume 2|Elizabeth Bisland