弟娘
also: おとむすめ
Meanings
1
younger daughter
Refers specifically to a younger daughter, often in contrast to an older daughter (姉娘). The term is somewhat literary or used in formal contexts; in everyday speech, 下の娘 or simply 妹 may be more common.
His younger daughter is still in elementary school.
The older daughter is a university student, and the younger daughter is a high school student.