Search Result for "stepmother": 
Wordnet 3.0

NOUN (1)

1. the wife of your father by a subsequent marriage; 



The Collaborative International Dictionary of English v.0.48:

Stepmother \Step"moth`er\, n. [AS. ste['o]pm[=o]der.]
   The wife of one's father by a subsequent marriage.
   [1913 Webster]


WordNet (r) 3.0 (2006):

stepmother
    n 1: the wife of your father by a subsequent marriage