noun (plural sisters-in-law) Date: 15th century the sister of one's spouse, 2. the wife of one's brother, the wife of one's spouse's brother
SISTER-IN-LAW
Meaning of SISTER-IN-LAW in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012