step sister


one's stepfather's or stepmother's daughter by a previous marriage.

1400–50; late Middle English; see step-, sister Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stepsister (ˈstɛpˌsɪstə)
a daughter of one's stepmother or stepfather by a union with someone other than one's father or mother respectively

Collins English Dictionary - Complete & Unabridged 10th Edition
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