Noun

1. A male relative of one's generation, separated by one degree of marriage:
   • The brother of one's spouse.
   • The husband of one's sibling.
2. Co-brother-in-law: A male relative of one's generation, separated by two degrees of marriage:
   • The husband of the sibling of one's spouse.
   • The brother of the spouse of one's sibling.

Quotations

• 1597, William Shakespeare, Henry IV, Part I, act 1, sc. 3,

  We at our own charge shall ransom straight

  His brother-in-law, the foolish Mortimer;

Related terms

• daughter-in-law
• father-in-law
• mother-in-law
• sister-in-law
• son-in-law
• co-wife