mother-in-law

from WordNet (r) 3.0 (2006)
mother-in-law
    n 1: the mother of your spouse
from 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]
from 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.
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