Definition from Wiktionary, the free dictionary
From Middle English half-süster, equivalent to half- + sister. Compare Dutch halfzus, halfzuster (“half-sister”), German Halbschwester (“half-sister”), Swedish halvsyster (“half-sister”), Icelandic hálfsystir (“half-sister”).
- The daughter of one's mother who has a different father, maternal half sister, uterine sister
- The daughter of one's father who has a different mother, paternal half sister.
maternal/paternal half sister
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