English

Noun

co-brother ‎(plural co-brothers), also (in sense 1) co-brethren

1. colleague ("brother" in the same craft, occupation, or society)

   My co-brethren of the quill.

   • 1900, Arthur Francis Leach, Report on the manuscripts of the corporation of Beverley, page 91:

     At the death of the co-sisters of the Guild, every co-brother of the Guild to be present

2. (India) One's wife's sister's husband.
   • 2007, Sethi, A Handbook Of Standard English And Indian Usage: Vocabulary And Grammar, page 55:

     If your wife doesn't have a sister, you just can't have a co-brother.

Synonyms

• confrère
• co-brother-in-law (in the more common sense only)

Hypernyms

• brother-in-law

Coordinate terms

• co-sister