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