a·bra·sion 
(ə-brāzhən)
(ə-brāzhən)n.
1. The process of wearing down or rubbing away by means of friction.
2.
a. A scraped or worn area.
b. A scraped area on the skin or on a mucous membrane, resulting from injury or irritation.
[Medieval Latin abrāsiō, abrāsiōn-, from Latin abrāsus, past participle of abrādere, to scrape off; see ABRADE.]