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 Middle English. See sister, in, law1

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World English Dictionary
sister-in-law
 
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
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00:10
Sister-in-law is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
Example sentences
The divorced duchess had cashed in with an anodyne memoir, some of which annoyed her sister-in-law-particularly one fatal line.
My sister-in-law bought a bunch of holiday-themed fabrics, and sewed them into
  bags.
My sister-in-law is a vet, so she knows all about the importance of
  vaccinations.
He belongs to her sister-in-law, who has been missing for days.
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