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
Words nearby diamond drill
Example sentences 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