Definitions

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)

Etymologies

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)

Examples

  • And Omort, her half brother and king of the plane of Rothkalina, was wiping off his bloody handswhich meant hed torn the oracles head from her neck in a fit of rage, piqued no doubt by whatever shed foretold.

    Kiss of a Demon King

  • It took them very little time to make the crossing, and Sir William, Lord James's half brother and keeper of the castle, was waiting for them at the landing.

    Mary Queen Of Scotland And The Isles

  • But after living with my half brother the incubus for most of a year, I mostly found it annoying.

    Dead Beat

  • On the very end of the bench was Lucius Aurelius Cotta, son of the dead consul Cotta, nephew of the ex-praetor Marcus Cotta, and half brother of Aurelia, the wife of young Gaius Julius Caesar.

    The First Man in Rome

  • His firm, Olmsted Brothers, which he ran with his half brother John, was the largest and best known in the country, responsible for not only landscape architecture but also town planning.

    Makeshift Metropolis

  • “That is my half brother Agathon,” whispered Laodike.

    Lord of the Silver Bow

  • What I wanted to do was adjust to married life, set up house (well, the house had been set up for more than a year, thanks to Jessica and her big bucks, but I was still finding places for our wedding gifts), finish writing thank-you notes (yawn), and settle down to the job of raising BabyJon, my half brother and legal ward.

    Undead and Unworthy

  • Bomilcar the half brother sat quietly, waiting for Jugurtha to abandon his brooding.

    The First Man in Rome

  • It had been his eleven-year-old half brother Hektor, carrying a flaming torch.

    Lord of the Silver Bow

  • Aurelia remained the only girl her mother bore, fascinatingly situated; by her father, she had a half brother older than herself, and by her mother, she had three half brothers younger than herself who also happened to be her first cousins because her father had been their uncle, where their father was her uncle.

    The First Man in Rome

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