Search Result for "stepsister": 
Wordnet 3.0

NOUN (1)

1. a sister who has only one parent in common with you;
[syn: half sister, half-sister, stepsister]



The Collaborative International Dictionary of English v.0.48:

Stepsister \Step"sis`ter\, n.
   A daughter of one's stepfather or stepmother by a former
   marriage.
   [1913 Webster]


WordNet (r) 3.0 (2006):

stepsister
    n 1: a sister who has only one parent in common with you [syn:
         half sister, half-sister, stepsister]