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Meaning of brother-in-law

broth•er-in-law

Pronunciation: (bru'ur in lô"), [key]
— pl. broth•ers-in-law.
  1. the brother of one's husband or wife.
  2. the husband of one's sister.
  3. the husband of one's wife's or husband's sister.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.