嫡ちゃく男なん

noun

legitimate eldest son; heir

Refers specifically to the eldest son born to the legal wife, traditionally the primary heir. Used in historical, legal, or family contexts.

• 彼かれは将しょう軍ぐん家けの嫡ちゃく男なんとして生うまれた。

  He was born as the legitimate eldest son of the shogun family.

• 嫡ちゃく男なんが家か督とくを継つぐのが当とう時じの慣かん習しゅうだった。

  It was the custom at that time for the legitimate eldest son to succeed as head of the family.