任何堅硬、尖銳的材料，將之與比較柔軟與低抗阻力的表面相互摩擦時，會把後者磨掉。用於磨光金屬、石材、木材、玻璃，以及其他材料。以粉狀物、泥漿、研磨布料、研磨紙和轉輪的形式出售。其特性為硬度和顆粒尺寸。硬度可以用莫氏硬度表（Mohs' scale）來測量，在此表中，鑽石的硬度為10。Any hard, sharp material that wears away a softer, less resistant surface when the two are rubbed together. They are used to used to polish metals, stone, wood, glass, and other materials. They are sold as powders, slurries, and as abrasive cloths, papers, and wheels. They are characterized by hardness and particle size. Their hardness can be measured on the Mohs' scale in which the diamond is rated as a 10.Cualquier material duro y agudo que desgasta una superficie más blanda y menos resistente cuando se les frota entre sí.Elk hard, scherp materiaal dat een zachter, minder bestendig oppervlak afslijt wanneer de twee over elkaar worden gewreven.