brother-in-law
noun
broth·er-in-law
ˈbrə-t͟hər-ən-ˌlȯ
ˈbrət͟h-rən-,
ˈbrə-t͟hərn-
plural brothers-in-law
ˈbrə-t͟hərz-ən-
1
: the brother of one's spouse
2
a
: the husband of one's sibling
b
: the husband of one's spouse's sibling
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Merriam-Webster unabridged
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