What does "co-mother-in-law" mean?

The mother of one's children-in-law; that is, the mother-in-law of one's children, or, the mother of one spouse in relation to the parents of the other spouse; either of two or more women whose children marry each other, such as the mother of a bride vis-à-vis the mother of the groom.

What is a synonym for "co-mother-in-law"?

Common synonyms include: co-grandmother.

Co-mother-in-law

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
The mother of one's children-in-law; that is, the mother-in-law of one's children, or, the mother of one spouse in relation to the parents of the other spouse; either of two or more women whose children marry each other, such as the mother of a bride vis-à-vis the mother of the groom. uncommon
"After dinner, the discerning eye of the co-mother-in-law divines the work of darkness. Your wife also is an expectant mother !"

Synonyms

All synonyms

co-grandmother

Example

More examples

"After dinner, the discerning eye of the co-mother-in-law divines the work of darkness. Your wife also is an expectant mother !"

Etymology

From co- + mother-in-law or co-mother + -in-law.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.