rock bolt
noun Mining, Civil Engineering.
a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber.
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Origin of rock bolt
First recorded in 1955–60
Words nearby rock bolt
rock and rye, rockaway, rock bass, rock beauty, rock blenny, rock bolt, rock boot, rock borer, rock bottom, rock-bound, rock brake
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020