Definitions

from The Century Dictionary.

  • noun A sister by one parent only.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A sister by one parent only.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Alternative spelling of half sister.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a sister who has only one parent in common with you
  • noun a sister who has only one parent in common with you

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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").

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