brother-in-law

[bruhth-er-in-law]
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; Middle English

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World English Dictionary
brother-in-law
 
n , 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 10th Edition
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Etymonline
Word Origin & History

brother in law
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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Example sentences
My kids were insufficiently impressed, but my brother in law thought it was pretty cool.
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