Search Result for "half-brother": 
Wordnet 3.0

NOUN (1)

1. a brother who has only one parent in common with you;
[syn: stepbrother, half-brother, half brother]



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]


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]