belle-sœur
Meanings
Noun
1. sister-in-law (wife's or husband's sister)
2. sister-in-law (brother's or sister’s wife)
3. step-sister, stepsister
Examples7
Mary and Alice are sisters-in-law.
My sister-in-law had four children in five years.
The sister of your husband is your sister-in-law.
My sister-in-law got recently married.
Cinderella had two wicked stepsisters.
My sister-in-law is a good friend of mine.