stepbrother

[ step-bruhth-er ]
/ ˈstɛpˌbrʌð ər /

noun

one's stepfather's son or stepmother's son by a previous marriage.

Origin of stepbrother

late Middle English word dating back to 1400–50; see origin at step-, brother
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for stepbrother

stepbrother

/ (ˈstɛpˌbrʌðə) /

noun

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