noun, plural brothers-in-law.
the brother of one's husband or wife.
the husband of one's sister.
the husband of one's wife's or husband's sister.

1250–1300; Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n , pl brothers-in-law
1.  the brother of one's wife or husband
2.  the husband of one's sister
3.  the husband of the sister of one's husband or wife

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
My sister and brother-in-law are suitably awestruck.
Alex knew of the grave, and he knew who had laid the body to rest: his own
One of the best things that happened to me as a grad student was receiving the
  gift of a laptop from my brother-in-law.
And you don't listen to your brother-in-law when he says that you don't really
  need all four brakes.
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