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mother-in-law

[muhth -er-in-law] /ˈmʌð ər ɪnˌlɔ/
noun, plural mothers-in-law.
1.
the mother of one's husband or wife.
Origin
1350-1400
1350-1400; Middle English modyr in lawe
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mothers in law

mother-in-law

noun (pl) mothers-in-law
1.
the mother of one's wife or husband
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for mothers in law

mother-in-law

n.

mid-15c., "mother of one's spouse," from mother (n.1) + in-law. 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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12
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