Mother-out-law
noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 The mother of one's boyfriend or girlfriend.
- 2 The mother of any of one's friends.
- 3 The mother of one's ex-spouse.
"The old Cape Cod commune-istas had caught up enough with my mother out-law and were now asking after notable events in the lives of her offspring."
Example
More examples"The old Cape Cod commune-istas had caught up enough with my mother out-law and were now asking after notable events in the lives of her offspring."
Etymology
From mother + -out-law, by analogy to mother-in-law.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.