co-sister-in-law

Meaning

Noun

• One's spouse's sister-in-law, especially one's husband's brother's wife, one's brother's wife in relation to the spouses of his siblings; either of two (or more) women who are married to brothers, in relation to the other.
• One's brother-in-law or sister-in-law's sister; one's sibling's spouse's sister; either of two (or more) women whose siblings are married, in relation to the other.

Related

Similar words

• co-sister
• co-aunt (in relation to a common niece or nephew)

Origin

• From co- + sister-in-law or co-sister + -in-law.