headmaster
noun /ˌhedˈmɑːstə(r)/
  /ˌhedˈmæstər/
 (British English, becoming old-fashioned) (British English usually head teacher)
 (North American English usually principal)
- a male teacher who is in charge of a school, especially a private schoolExtra ExamplesTopics Educationc1
- He went on to become headmaster of a school in Bath.
 - He is a retired headmaster, living in Edinburgh.
 - There was a notice board on the wall outside the headmaster's study.