abra·sion 
/əˈbreɪʒən/ noun
plural abra·sions /əˈbreɪʒən/ noun 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
▪ She fell and suffered cuts, bruises, and abrasions [=scrapes] on her legs.
▪ abrasion of rocks by wind and water
