Abrasion - Definition
abrasion
n 1: an abraded area where the skin is torn or worn off [syn:
abrasion, scratch, scrape, excoriation]
2: erosion by friction [syn: abrasion, attrition,
corrasion, detrition]
3: the wearing down of rock particles by friction due to water
or wind or ice [syn: grinding, abrasion, attrition,
detrition]