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sister in law

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sis⋅ter-in-law

[sis-ter-in-law]
–noun, plural sis⋅ters-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:
1400–50; late ME. See sister, in, law 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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