abrasion

plural abrasions

1. countableuncountableThe act of abrading, wearing, or rubbing off; the wearing away by friction.First known use First attested in the mid 17ᵗʰ century.

   The metal surface showed signs of abrasion after years of use.

2. countableuncountableAn act of abrasiveness.
3. countableobsoleteuncountableThe substance thus rubbed off; debris.First known use First attested in the mid 18ᵗʰ century.
4. countableuncountablegeographyThe effect of mechanical erosion of rock, especially a river bed, by rock fragments scratching and scraping it.First known use First attested in the mid 19ᵗʰ century.
5. countableuncountableAn abraded, scraped, or worn area.First known use First attested in the mid 20ᵗʰ century.
6. countableuncountablemedicineA superficial wound caused by scraping; an area of skin where the cells on the surface have been scraped or worn away.First known use First attested in the mid 20ᵗʰ century.

   The doctor cleaned the small skin abrasion on her knee.

7. countableuncountabledentistryThe wearing away of the surface of the tooth by chewing.