abrasion

noun7

1. •
   The act of abrading, wearing, or rubbing off; the wearing away by friction.

   • The metal surface showed signs of abrasion after years of use.
2. •
   An abraded, scraped, or worn area.
3. •
   A superficial wound caused by scraping; an area of skin where the cells on the surface have been scraped or worn away.

   • The doctor cleaned the small skin abrasion on her knee.
4. •
   The effect of mechanical erosion of rock, especially a river bed, by rock fragments scratching and scraping it.
5. •
   The wearing away of the surface of the tooth by chewing.
6. •
   An act of abrasiveness.
7. •
   (no longer used) The substance thus rubbed off; debris.