brother-in-law


broth·er–in–law

noun \ˈbrə-thər-ən-ˌl, ˈbrəth-rən-, ˈbrə-thərn-\

: the brother of your husband or wife

: the husband of your sister

plural broth·ers–in–law \ˈbrə-thərz-ən-\

Full Definition of BROTHER-IN-LAW

1
:  the brother of one's spouse
2
a :  the husband of one's sister
b :  the husband of one's spouse's sister

First Known Use of BROTHER-IN-LAW

14th century

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