abrasion (n.)

1650s, "act of abrading," from Medieval Latin abrasionem (nominative abrasio) "a scraping," noun of action from past-participle stem of Latin abradere "to scrape away, shave off," from ab "off" (see ab-) + radere "to scrape," possibly from an extended form of PIE root *red- "to scrape, scratch, gnaw." From 1740 as "result of abrasion."