Search Result for "half-sister": 
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:

Half-sister \Half"-sis`ter\ (-s[i^]s`t[~e]r), n.
   A sister by one parent only.
   [1913 Webster]


WordNet (r) 3.0 (2006):

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