noun
( pl. sisters-in-law ) the sister of your husband or wife; your brother's wife; the wife of your husband or wife's brother
—compare brother-in-law
noun
( pl. sisters-in-law ) the sister of your husband or wife; your brother's wife; the wife of your husband or wife's brother
—compare brother-in-law
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005