1. A very hard, brittle, heat-resistant substance that is used to grind the edges or rough surfaces of an object. ...
2. a harsh cleaning agent that destroys the surface of a coin.
3. Diamonds of Industrial grade are used as abrasives for tools such as drill bits and grinding wheels. Smaller particles may also be used for polishing.
4. A coarse material used in blast cleaning, such as sand, steel shot, glass beads or plastics.
5. The cutting medium of an abrasive jet. Usually garnet or similar "sand like" substance.
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