'Sister-in-law' definitions:

Definition of 'sister-in-law'

noun

The sister of your spouse

Definition of 'Sister-in-law'

From: GCIDE

Sister-in-law \Sis"ter-in-law`\, n.; pl. Sisters-in-law. The sister of one's husband or wife; also, the wife of one's brother; sometimes, the wife of one's husband's or wife's brother. [1913 Webster]

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