The Collaborative International Dictionary
Brothers-in-law
Brother-in-law \Broth"er-in-law`\, n.; pl. Brothers-in-law. The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister.
Wiktionary
brothers-in-law
n. (brother-in-law English)
WordNet
brothers-in-law
See brother-in-law
brother-in-law
n. a brother by marriage
[also: brothers-in-law (pl)]