trephination是什么意思

n.[医]环钻术 环锯术

1. Trephination was commonly used in ancient civilizations as a method to relieve pressure on the brain.
2. The ancient Egyptians practiced trephination for both medical and religious purposes.

切开颅骨；切开头部的手术；以放血、减轻头痛为目的而切开颅骨的外科手术。