a measurement system used by commercial manufacturers to determine the relative hardness of objects based on the depth of indentation from a heavy object; also Rockwell hardness
Each Rockwell scale is an arbitrarily defined range of numbers from 0 to 100 covering a specific range of material hardness. Many knife manufacturers indicate the Rockwell hardness of their knife blades.
noun 1. mineral wool. noun 1. another name for mineral wool
noun 1. stonework.
noun 1. an American wren, Salpinctes obsoletus, inhabiting the foothills, badlands, and mesa country of the western U.S. and Mexico.
adjective, rockier, rockiest. 1. full of or abounding in rocks. 2. consisting of rock. 3. rocklike: wood with a rocky hardness. 4. firm; steadfast: rocky endurance. 5. unfeeling; without sympathy or emotion: my rocky heart. adjective, rockier, rockiest. 1. inclined or likely to rock; tottering; shaky; unsteady. 2. difficult or uncertain; full of hazards or […]