Definitions

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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The daughter of one's mother who has a different father, maternal half sister, uterine sister
  • n. The daughter of one's father who has a different mother, paternal half sister.

Etymologies

From Middle English half-süster, equivalent to half- +‎ sister. Compare Dutch halfzus, halfzuster ("half-sister"), German Halbschwester ("half-sister"), Swedish halvsyster ("half-sister"), Icelandic hálf-systir ("half-sister"). (Wiktionary)

Examples

  • King Wyborn of Galea had had two children with his queen and first wife, so Kahlan had both an older half sister and a half brother.

    Men Don't Leave Me

  • [3] Mr. Wickham married Mr. Tazewell's aunt, a half sister of Judge Henry Tazewell.

    Discourse of the Life and Character of the Hon Littleton Waller Tazewell

  • The Macedonian king was so grateful that he promised Langarus his half sister Cyna in marriage when he returned.

    Alexander the Great

  • Hettiah, Omorts half sister and Sabines arch-nemesis, arrived then, hastening up the dais steps to stand beside Omorts throneher rightful place, since she was his concubine as well as his relation.

    Kiss of a Demon King

  • Bin Laden encouraged Khalifa to marry his half sister Shaikha, to whom he is close, as she is the other particularly religiously observant member of his family.

    The Longest War

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