noun
English-derived loanword used in Japanese to refer to one's spouse's mother. Less common than native terms like 義母 (ぎぼ) or 姑 (しゅうとめ), and may carry a slightly informal or jocular tone.
彼のマザーインローはとても親切だ。
His mother-in-law is very kind.
マザーインローとの関係は難しいこともある。
Relationships with a mother-in-law can be difficult sometimes.