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[sis-ter-in-law] /ˈsɪs tər ɪnˌlɔ/
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.
Origin of sister-in-law
1400-50; late Middle English. See sister, in, law1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for sister-in-law
Contemporary Examples
Historical Examples
  • "Well, I'm not going to beat about the bush," continued her sister-in-law abruptly.

    Dust Mr. and Mrs. Haldeman-Julius
  • I found my host at dinner with his wife, little daughter, and sister-in-law.

    In the Heart of Vosges Matilda Betham-Edwards
  • His sister-in-law treated him badly and never gave him enough to eat.

  • His sister-in-law wished to see his art, so she poured the rice into the pot.

  • If this young lady is my sister-in-law, surely she and I can settle up our own affairs.

    The Avenger E. Phillips Oppenheim
British Dictionary definitions for sister-in-law


noun (pl) sisters-in-law
the sister of one's husband or wife
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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Word Origin and History for sister-in-law

mid-15c.; see sister + in-law.

Online Etymology Dictionary, © 2010 Douglas Harper
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