headmasterheadmaster /ˌhedˈmɑːstə $ ˈhedˌmæstər/ noun [countable] British English a male teacher who is in charge of a school（学校的）男校长director (hombre) de un colegiodiretor (homem) de uma escola（学校の）男性校長학교를 책임지는 남성 교장 SYN  head teacher, principal American English