The Collaborative International Dictionary
Sisters-in-law
Sister-in-law \Sis"ter-in-law`\, n.; pl. Sisters-in-law. The sister of one's husband or wife; also, the wife of one's brother; sometimes, the wife of one's husband's or wife's brother.
Wiktionary
sisters-in-law
n. (sister-in-law English)
WordNet
sister-in-law
n. the sister of your spouse
[also: sisters-in-law (pl)]
sisters-in-law
See sister-in-law
Usage examples of "sisters-in-law".
One by one, Mae Su's sister, her two sisters-in-law, and a niece were also put to work in the sausage factory.
His sisters-in-law, bless them, were laughing and chattering as if they had known her for years.