'Half-brother' definitions:
Definition of 'half-brother'
(from WordNet)
noun
A brother who has only one parent in common with you [syn: stepbrother, half-brother, half brother]
Definition of 'Half-brother'
From: GCIDE
- Half-brother \Half"-broth`er\ (-br[u^]th`[~e]r), n. A brother by one parent, but not by both. [1913 Webster]