Search Result for "mother-in-law": 
Wordnet 3.0

NOUN (1)

1. the mother of your spouse; 



The Collaborative International Dictionary of English v.0.48:

Mother-in-law \Moth"er-in-law`\, n.
   The mother of one's husband or wife.
   [1913 Webster]


WordNet (r) 3.0 (2006):

mother-in-law
    n 1: the mother of your spouse


Bouvier's Law Dictionary, Revised 6th Ed (1856):

MOTHER-IN-LAW. In Latin socrus. The mother of one's wife, or of one's
husband.