What is the meaning of rock drill?

noun

WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). rock drill. Retrieved September 20, 2026, from http://smartdefine.org/rock_drill/definitions/1307240
ChicagoWordNet. 2010. "rock drill" http://smartdefine.org/rock_drill/definitions/1307240 (accessed September 20, 2026).
HarvardWordNet 2010, rock drill, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/rock_drill/definitions/1307240>.
MLAWordNet. "rock drill" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/rock_drill/definitions/1307240>