- one's stepfather's son or stepmother's son by a previous marriage.
Origin of stepbrother
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for stepbrother
Rafi, otherwise known as “Bro lo el Cuñado,” is the brother of the stunning Sofia, and stepbrother to Ruxin (Nick Kroll).Inside the Mind of ‘The League’s Rafi: Jason Mantzoukas and Seth Rogen on TV’s Craziest Dude
September 25, 2014
This stepbrother of his was the only tie he had and of course that is not a blood tie.
This man in the hotel dining room could not be his stepbrother.
It was not a car like Uncle Clem's—not even a stepbrother to it.
He, too, was only stepson and stepbrother to the family he fathered.
The remarks about her dependence on her stepbrother slid from her very lightly.Loyal to the School
- a son of one's stepmother or stepfather by a union with someone other than one's father or mother respectively
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
Word Origin and History for stepbrother
Online Etymology Dictionary, © 2010 Douglas Harper