noun (n)

• an abraded area where the skin is torn or worn off(noun.state)

  Synonym:
  excoriation, scrape, scratch
  

  source: wordnet30
• erosion by friction(noun.process)

  Synonym:
  attrition, corrasion, detrition
  

  source: wordnet30
• the wearing down of rock particles by friction due to water or wind or ice(noun.phenomenon)

  Synonym:
  attrition, detrition, grinding
  

  source: wordnet30
• The act of abrading, wearing, or rubbing off; the wearing away by friction; as, the abrasion of coins.(noun)

  source: webster1913