Search Result for "foster-sister": 
Wordnet 3.0

NOUN (1)

1. your foster sister is a female who is not a daughter of your parents but who is raised by your parents;
[syn: foster-sister, foster sister]



WordNet (r) 3.0 (2006):

foster-sister
    n 1: your foster sister is a female who is not a daughter of
         your parents but who is raised by your parents [syn:
         foster-sister, foster sister]