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Wiktionary
half sister

n. 1 The daughter of one's mother who has a different father, maternal half sister, uterine sister 2 The daughter of one's father who has a different mother, paternal half sister.

WordNet
half sister

n. a sister who has only one parent in common with you [syn: stepsister]

Usage examples of "half sister".

She was blood kin of the Antes house, favored second cousin of Ivanova, half sister to Prince Rodek.