Abrasion (noun)

1. A scrape or injury on the skin or other surface caused by rubbing or friction.
2. The process of rubbing or scraping away a surface.

Origin:

Late middle english: from latin abrasio(n-), from abradere "scrape away".

Examples:

1. She sustained an abrasion on her knee after falling on the pavement.
2. The rock's surface was worn smooth by centuries of abrasion from the river.
3. The abrasion on the metal surface was caused by friction with another metal.
4. The abrasion on his hand was treated with a bandage.
5. Abrasion is one of the main causes of tooth wear.