step sister

stepsister

[step-sis-ter]
noun
one's stepfather's or stepmother's daughter by a previous marriage.

Origin:
1400–50; late Middle English; see step-, sister

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World English Dictionary
stepsister (ˈstɛpˌsɪstə)
 
n
a daughter of one's stepmother or stepfather by a union with someone other than one's father or mother respectively

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