noun
trepanation; cranial perforation
Medical term for the surgical procedure of drilling or scraping a hole into the skull.
古代の頭部穿孔の痕跡が頭蓋骨に残っていた。
Traces of ancient trepanation remained on the skull.
Compound of 頭部 (tōbu, 'head') and 穿孔 (senkō, 'perforation'). The exact historical derivation is uncertain; the spelling is conventionally associated with the medical meaning.