stepsister

n. daughter of one's stepparent

Traditionally, a stepfamily is the family one acquires when a parent enters a new marriage, whether the parent was widowed or divorced. For example, if one's mother dies and one's father marries another woman, the new woman is one's stepmother. A less common term is blended family. The counseling slogan "Stepfamilies are born out of loss" applies to such a case. In modern stepfamilies, there is recognition that the biological parents may never have married. Unless one bioparent of a stepchild is deceased, typical nuclear stepfamilies do not live in one house, consisting of three or more parents, biological and otherwise. It is also possible, in a less strict sense, that the new mate chooses the role of full- or part-time caregiver without marital commitment.
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Noun
1. a sister who has only one parent in common with you
(synonym) half sister
(hypernym) sister, sis

(n.)
A daughter of one's stepfather or stepmother by a former marriage.
  

stepsister /'step,sistə/
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