A male pupil or student (in a school); a schoolboy.
教室には男子生徒が十人いる。
There are ten male students in the classroom.
彼はクラスで一番背の高い男子生徒だ。
He is the tallest male student in the class.
この学校では男子生徒も女子生徒も同じ制服を着る。
At this school, both male and female students wear the same uniform.