The sister of one's spouse. / The wife of one's sibling. / The wife of the sibling of one's spouse. / The sister of the spouse of one's sibling.

plural of sister-in-law

Alternative form of sister-in-law

(nonstandard) plural of sister-in-law

plural of sister in law

The half sister of one's spouse. / The wife of one's half-sibling. / The wife of the half-sibling of one's spouse.

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.

plural of co-sister-in-law

plural of half sister-in-law

The sister of one's boyfriend or girlfriend. / Girlfriend of one's brother or sister. / The sister of one's ex-spouse.