Hello!! I am going to break down the word first. Vagino means vagina, perineo means perineum (area between the anus and the scrotum), and tomy means to make an incision or cut. The translation would be to make an incision to repair a perineal tear (which means the vagina has separated from the anus). Perineal tears are usually caused by childbirth. I hope I helped and gave the answers you were looking for!! Have a great evening.
