a prickleback, Xiphister mucosus, of the Pacific coast from southern California to Alaska.
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.
- Rock boot
noun 1. a tight-fitting rock-climbing boot with a canvas or suede upper and smooth rubber sole, designed to give good grip on small holds
- Rock borer
noun 1. any of various sea creatures that bore into rock, such as some sea urchins, sponges, annelid worms, barnacles, isopods, and molluscs
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 […]