Diamond drill

(Engin.)	a rod or tube the end of which is set with black diamonds; - used for perforating hard substances, esp. for boring in rock.
	See under Diamond.

diamond drill

[′dī·mənd ‚dril] (design engineering) A drilling machine with a hollow, diamond-set bit for boring rock and yielding continuous and columnar rock samples.

diamond drill

In exploratory drilling, a rotary drill having a coring bit which is studded with black diamonds.

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