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noun, feminine

belle-sœur

/bɛl.sœʁ/

noun, feminine/bɛl.sœʁ/plural: belles-sœurs

sister-in-law (wife's or husband's sister); sister-in-law (brother's or sister’s wife); step-sister, stepsister

Inherited from Middle French [Term?]. By surface analysis, belle- + sœur.