外がい姑こ

noun

mother-in-law (husband's mother)

Rare, formal term specifically for the husband's mother. In modern Japanese, 義母 (ぎぼ) or 姑 (しゅうとめ) are far more common.

• 古こ文ぶん書しょでは「外がい姑こ」が夫おっとの母ははを指さすことがある。

  In old documents, 外姑 can refer to the husband's mother.