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sister-in-law

[sis-ter-in-law] /ˈsɪs tər ɪnˌlɔ/
noun, plural sisters-in-law.
1.
the sister of one's husband or wife.
2.
the wife of one's brother.
3.
the wife of the brother of one's husband or wife.
Origin
1400-1450
1400-50; late Middle English. See sister, in, law1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sister in law

sister-in-law

noun (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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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