From Longman Dictionary of Contemporary Englishhead teacherˌhead ˈteacher, headteacher ●●○ noun [countable] British EnglishBOSES the teacher who is in charge of a school SYN principal American English
Examples from the Corpus
head teacher• The man with whom he joined to start the program is head teacher.• In the evening I consulted a friend who is also a local head teacher.• First the head teacher asks the girl to put her allegations in writing.• The head teacher has the reputation of the school to protect, and might not want to lose an otherwise good teacher. 