Definitions for half-brother
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Princeton's WordNet
stepbrother, half-brother, half brother(noun)
a brother who has only one parent in common with you
Webster Dictionary
Half-brother(noun)
a brother by one parent, but not by both
Citation
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"half-brother." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/half-brother>.