1. A mechanical operation performed on silicon substrates of semiconductors to provide a smooth surface for epitaxial deposition or diffusion of impurities.

2. A mechanical operation performed on quartz crystals to alter their physical size and hence their resonant frequencies.

1. Reducing a material to relatively small particles.

2. Removing material from a workpiece with a grinding wheel.

The act or process of continuing to drill after the bit or core barrel is blocked, thereby crushing and destroying any core that might have been produced.