頭ず蓋がい穿せん孔こうMeanings1nountrepanation; cranial perforationMedical term for the surgical procedure of drilling or scraping a hole into the skull. Also referred to as 頭部穿孔.See also: 頭部穿孔古こ代だい文ぶん明めいでは、頭ず蓋がい穿せん孔こうが治ち療りょう目もく的てきで行おこなわれていた。In ancient civilizations, trepanation was performed for therapeutic purposes.