Half-brother

from WordNet (r) 3.0 (2006)
half-brother
    n 1: a brother who has only one parent in common with you [syn:
         {stepbrother}, {half-brother}, {half brother}]
from The Collaborative International Dictionary of English v.0.48
Half-brother \Half"-broth`er\ (-br[u^]th`[~e]r), n.
   A brother by one parent, but not by both.
   [1913 Webster]
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