From King Dictionary of Contemporary English
Related topics: Family
half-sisterˈhalf-ˌsister ●●○ noun [countable] SSFa sister who is the daughter of only one of your parentshalf-brother
Examples from the Corpus
half-sisterTut, meanwhile, married his half-sister, Ankhesenamen.The more substantial is that the justices directed that T.'s contact with her older half-sister should be supervised.Mrs Aitken, meet Shiona Fergusson, Kirsty's half-sister.Mitchell rented it from the half-sister of the owner, a schoolteacher gone to Toronto with her three chil-dren.The bees, they found, were more aggressive towards half-sisters.Apart from his brother, he had one sister, one half-brother, and two half-sisters.Mrs Grant invites her younger half-sister Mary Crawford to live with her at the parsonage.