Rock-bolt
noun, Mining, Civil Engineering.
1.
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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noun 1. any of various sea creatures that bore into rock, such as some sea urchins, sponges, annelid worms, barnacles, isopods, and molluscs
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adjective 1. at the lowest possible limit or level; extremely low: rock-bottom prices. noun 1. the very lowest level: He went bankrupt and touched rock bottom. noun 1. the lowest possible level (as modifier): rock-bottom prices rock bottom The lowest possible level, absolute bottom, as in Wheat prices have reached rock bottom. This idiom alludes […]
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adjective 1. hemmed in, enclosed, or covered by rocks; rocky: the rock-bound coast of Maine. adjective 1. hemmed in or encircled by rocks Also (poetic) rock-girt
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noun 1. any of various ferns of the genera Pellaea and Cryptogramma, which grow on rocky ground and have sori at the ends of the veins