noun (plural brothers-in-law) Date: 14th century the brother of one's spouse, 2. the husband of one's sister, the husband of one's spouse's sister
BROTHER-IN-LAW
Meaning of BROTHER-IN-LAW in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012