half-sister

from 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}]
from 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]
antiflux / dictionary / half-sister
[email protected]