brother-in-law

The definition of brother in law is a man who is related to you through marriage to your spouse or sibling, not through blood.

(noun)

  1. An example of a brother in law is your sister's husband.
  2. An example of a brother in law is your husband's brother.

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See brother-in-law in Webster's New World College Dictionary

noun pl. brothers-in-law

  1. the brother of one's husband or wife
  2. the husband of one's sister
  3. the husband of the sister of one's wife or husband

See brother-in-law in American Heritage Dictionary 4

noun pl. broth·ers-in-law (brŭÞˈərz-)
  1. The brother of one's spouse.
  2. The husband of one's sister.
  3. The husband of the sister of one's spouse.

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