foster-sister

foster sister

noun
a girl brought up with another child of different parents.

Origin:
1640–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
foster-sister

noun
your foster sister is a female who is not a daughter of your parents but who is raised by your parents 
foster sister

noun
your foster sister is a female who is not a daughter of your parents but who is raised by your parents [syn: foster-sister
WordNet® 3.0, © 2006 by Princeton University.
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