Abrasion

noun

1. The act of abrading, wearing, or rubbing off; the wearing away by friction.
2. The substance thus rubbed off; debris.
3. The effect of mechanical erosion of rock, especially a river bed, by rock fragments scratching and scraping it.
4. An abraded, scraped, or worn area.
5. A superficial wound caused by scraping; an area of skin where the cells on the surface have been scraped or worn away.