stepsister

from 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}]
from 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]
antiflux / dictionary / stepsister
[email protected]