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brother-in-law

[bruhth -er-in-law] /ˈbrʌð ər ɪnˌlɔ/
noun, plural brothers-in-law.
1.
the brother of one's husband or wife.
2.
the husband of one's sister.
3.
the husband of one's wife's or husband's sister.
Origin
1250-1300
1250-1300; Middle English
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for brothers in law

brother-in-law

noun (pl) brothers-in-law
1.
the brother of one's wife or husband
2.
the husband of one's sister
3.
the husband of the sister of one's husband or wife
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 brothers in law

brother-in-law

n.

c.1300; also brother in law; see brother. In Arabic, Urdu, Swahili, etc., brother-in-law, when addressed to a male who is not a brother-in-law, is an extreme insult, with implications of "I slept with your sister."

Online Etymology Dictionary, © 2010 Douglas Harper
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13
13
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