mothers in law

mother-in-law

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

Origin:
1350–1400; Middle English modyr in lawe

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mother-in-law
 
n , pl mothers-in-law
the mother of one's wife or husband

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
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, © 2010 Douglas Harper
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