I don't know what it looks like and I do NOT want to. Just thinking about that definition makes my skin crawl, like the mental equivalent of hearing fingernails on a chalkboard. I don't want to know why a surgeon would WANT to scrape someone's bones while they are still alive. Nope. Nope nope nope. I can tell you the word comes from Greek xūstēr, scraper, from xūein, to scrape. But that's it.