異い母ぼ妹まい

noun

younger half-sister (different mother)

Refers specifically to a younger sister who shares the same father but has a different mother. Used in family registers and formal contexts.

• 彼かの女じょは私わたしの異い母ぼ妹まいです。

  She is my younger half-sister from a different mother.

• 戸こ籍せき上じょうは異い母ぼ妹まいにあたる。

  She is legally my younger half-sister (different mother).