Co-sister-in-law Definition

noun

One's husband's brother's wife; or more generally one's spouse's sister-in-law, the sister of one spouse in relation to the siblings of the other spouse.

Wiktionary
One's brother-in-law or sister-in-law's sister; that is, one's sibling's spouse's sister (one's sister's husband's sister or one's brother's wife's sister).
Wiktionary

Other Word Forms of Co-sister-in-law

Noun

Singular:
co-sister-in-law
Plural:
co-sisters-in-law

Origin of Co-sister-in-law

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