Search Result for "stepson": 
Wordnet 3.0

NOUN (1)

1. the son your spouse by a former marriage; 



The Collaborative International Dictionary of English v.0.48:

Stepson \Step"son`\, n. [AS. ste['o]psunu.]
   A son of one's husband or wife by a former marriage.
   [1913 Webster]


WordNet (r) 3.0 (2006):

stepson
    n 1: the son your spouse by a former marriage