half-sister

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half-sister [noun]

a sister who is the daughter of only one of your parents

US /ˈhæfˌsɪs.tɚ/ 
UK /ˈhɑːfˌsɪs.tər/ 
Example: 

She is my half sister.

Longman Dictionary of Contemporary English

half-sister

ˈhalf-ˌsister BrE AmE noun [countable]
a sister who is the daughter of only one of your parents ⇨ half-brother

Oxford Advanced Learner's Dictionary

half-sister

ˈhalf-sister [half-sister half-sisters]       noun
a person's half-sister is a girl or woman who has either the same mother or the same father as them

compare  stepsister

Cambridge Advanced Learner's Dictionary

ˈ half- ˌ sister / ˈhɑːfˌsɪs.tə r /   / ˈhæfˌsɪs.tɚ / noun [ C ]

a sister who is the daughter of only one of your parents

Collins Advanced Learner’s English Dictionary

half-sister
 half-sisters
 N-COUNT: oft poss N
 Someone's half-sister is a girl or woman who has either the same mother or the same father as they have.

Merriam-Webster's Advanced Learner's Dictionary

half sister
 

half sister noun, pl ~ -ters [count] : a sister with the same father but a different mother or the same mother but a different father
• Emily is my half sister.