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mother-in-law

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moth⋅er-in-law

[muhth-er-in-law]
–noun, plural moth⋅ers-in-law.
the mother of one's husband or wife.

Origin:
1350–1400; ME modyr in lawe
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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moth·er-in-law   (mŭth'ər-ĭn-lô')
n.   pl. moth·ers-in-law (mŭth'ərz-)
  1. The mother of one's wife or husband.

  2. Archaic A stepmother.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

mother-in-law 
c.1440, "mother of one's spouse," from mother + in-law (q.v.). Also in early use, "stepmother." In British slang c.1884, mother-in-law was "a mixture of ales old and bitter."
Online Etymology Dictionary, © 2001 Douglas Harper
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