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stepbrother

[step-bruhth-er] /ˈstɛpˌbrʌð ər/
noun
1.
one's stepfather's son or stepmother's son by a previous marriage.
Origin
late Middle English
1400-1450
1400-50; late Middle English; see step-, brother
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for step brother

stepbrother

/ˈstɛpˌbrʌðə/
noun
1.
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
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