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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. 2015.
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Examples from the web for sister-in-law
  • 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 bags.
  • 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 vaccinations.
  • The divorced duchess had cashed in with an anodyne memoir, some of which annoyed her sister-in-law-particularly one fatal line.
  • Her sister-in-law, even her own sister, rushed to put more nails in her coffin.
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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