homeroom teacher; class teacher; form teacher
Refers to the teacher responsible for a specific class or homeroom in a school, handling administrative and pastoral duties.
The homeroom teacher checked the students' attendance.
She was my homeroom teacher in high school.
A shorter, more common term for 'homeroom teacher' or 'person in charge of a class'. 担任教師 is slightly more formal and explicit.
Synonym for 'class teacher', often used interchangeably with 担任教師.
Compound of 担任 (たんにん, 'in charge of a class') and 教師 (きょうし, 'teacher').