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in-law

[in-law] /ˈɪnˌlɔ/
noun
1.
a relative by marriage.
Origin
1890-1895
1890-95; back formation from mother-in-law, brother-in-law, etc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for in-law
  • My sister and brother-in-law are suitably awestruck.
  • My sister-in-law bought a bunch of holiday-themed fabrics, and sewed them into bags.
British Dictionary definitions for in-law

in-law

noun
1.
a relative by marriage
adjective
2.
(postpositive; in combination) related by marriage: a father-in-law
Word Origin
C19: back formation from father-in-law, etc
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 in-law
n.

1894, "anyone of a relationship not natural," abstracted from father-in-law, etc.

The position of the 'in-laws' (a happy phrase which is attributed ... to her Majesty, than whom no one can be better acquainted with the article) is often not very apt to promote happiness. ["Blackwood's Magazine," 1894]
The earliest recorded use of the phrase is in brother-in-law (13c.); the law is Canon Law, which defines degrees of relationship within which marriage is prohibited.

Online Etymology Dictionary, © 2010 Douglas Harper
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