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

diammonium phosphate, diamond, diamond anniversary, diamond bar, diamond bird, diamond drill, diamond dust, diamond head, diamond in the rough, diamond jubilee, diamond lane

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