dermabrasion n.

"the true skin, the skin beneath the epidermis," 1706, from Modern Latin derma, from Greek derma (genitive dermatos) "(flayed) skin, leather," from PIE root *der- "to split, flay, peel," with derivatives referring to skin and leather.

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" (see raze (v.)). From 1740 as "result of abrasion."