abrasion
abra·sion
/əˈbreıʒən/ noun , pl -sions
1 [ count ] : an injury caused by something that rubs or scrapes against the skin
She fell and suffered cuts, bruises, and abrasions [=scrapes] on her legs.
2 [ noncount ] : the act or process of damaging or wearing away something by rubbing, grinding, or scraping
abrasion of rocks by wind and water
