'Brother-in-law' definitions:

Definition of 'brother-in-law'

noun

A brother by marriage

Definition of 'Brother-in-law'

From: GCIDE

Brother-in-law \Broth"er-in-law`\, n.; pl. Brothers-in-law. The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister. [1913 Webster]

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