[ bruhth-er-in-law ]
/ ˈbrʌð ər ɪnˌlɔ /

noun, plural broth·ers-in-law.

the brother of one's husband or wife.
the husband of one's sister.
the husband of one's wife's or husband's sister.

Origin of brother-in-law

Middle English word dating back to 1250–1300 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for brother-in-law

British Dictionary definitions for brother-in-law


noun plural brothers-in-law

the brother of one's wife or husband
the husband of one's sister
the husband of the sister of one's husband or wife
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012