broth·er-in-law
| \ ˈbrə-t͟hər-ən-ˌlȯ
, ˈbrət͟h-rən-, ˈbrə-t͟hərn- \
, ˈbrət͟h-rən-, ˈbrə-t͟hərn- \
plural brothers-in-law\
ˈbrə-t͟hərz-ən-
\
\
Definition of brother-in-law
1
: the brother of one's spouse
2a
: the husband of one's sibling
b
: the husband of one's spouse's sibling
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“Brother-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brother-in-law. Accessed 28 May. 2022.
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The first known use of brother-in-law was in the 14th century
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