開頭

Verb

 * 1) to start; to begin

Noun

 * 1) start; beginning

Etymology
Coined in Japan of 🇨🇬-derived elements as a compound of.

Date of first appearance is uncertain, but this seems to be a relatively modern coinage.

Noun

 * 1)  craniotomy: the opening of the skull for surgery

Verb

 * 1)  to craniotomize, to perform a craniotomy: to open the skull for surgery