from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A brother to whom one is biologically related through one parent only.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A male sibling who has a different father, but the same mother. (Also known as maternal half brother)
  • n. A male sibling who has a different mother, but the same father. (Also known as paternal half brother)


From Middle English half-brother, equivalent to half- +‎ brother. Cognate with Dutch halfbroer ("halfbrother"), German Halbbruder ("halfbrother"), Danish halvbroder ("halfbrother"), Swedish halvbroder, halvbror ("halfbrother"), Icelandic hálfbróðir ("halfbrother"). (Wiktionary)


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