Definition: stepchild

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Source: WordNet (r) 1.7 

stepchild
     n : a child of your spouse by a former marriage

Source: Webster's Revised Unabridged Dictionary (1913) 

Stepchild \Step"child`\, n. [AS. ste['o]pcild.]
   1. A bereaved child; one who has lost father or mother.
      [Obs.]

   2. A son or daughter of one's wife or husband by a former
      marriage.