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

1400–50; late Middle English. See sister, in, law1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n , pl sisters-in-law
1.  the sister of one's husband or wife
2.  the wife of one's brother

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
He belongs to her sister-in-law, who has been missing for days.
My sister-in-law bought a bunch of holiday-themed fabrics, and sewed them into
That's the same as nieces and nephews, so moving out to help a brother and
  sister-in-law should be equally likely.
My sister-in-law is a vet, so she knows all about the importance of
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