stepsister

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stepsister [noun]

not your parents' daughter, but the daughter of a person one of your parents has married

US /ˈstepˌsɪs.tɚ/ 
UK /ˈstepˌsɪs.tər/ 

Longman Dictionary of Contemporary English

stepsister

stepsister /ˈstepsɪstə $ -ər/ BrE AmE noun [countable]
the daughter of your stepmother or stepfather

Oxford Advanced Learner's Dictionary

stepsister

step·sis·ter [stepsister stepsisters]   [ˈstepsɪstə(r)]    [ˈstepsɪstər]  noun
the daughter from an earlier marriage of your stepmother or stepfather

compare  half-sister

Cambridge Advanced Learner's Dictionary

stepsister / ˈstepˌsɪs.tə r /   / -tɚ / noun [ C ]

not your parents' daughter, but the daughter of a person one of your parents has married

→  Compare half-sister

Collins Advanced Learner’s English Dictionary

stepsister

[ste̱psɪstə(r)]
 stepsisters
 also step-sister
 N-COUNT: oft poss N

 Someone's stepsister is the daughter of their stepfather or stepmother.

Merriam-Webster's Advanced Learner's Dictionary

stepsister

step·sis·ter /ˈstɛpˌsɪstɚ/ noun, pl -ters [count] : the daughter of your stepmother or stepfather