Причастие прошедшего времени
Rare but attested verb meaning “to serve as a headmaster”.
Определения
To serve as the headmaster of a school. She headmastered the rural boarding school for nearly a decade.
Used attributively before another noun (e.g. "headmaster conference").
Определения
Relating to, characteristic of, or intended for a headmaster or headmasters. The annual headmaster conference will be held in July.