Dictionary

mother–in–law

noun moth·er–in–law \ˈmə-thər-ən-ˌl, ˈth-rən-, ˈmə-thərn-\

: the mother of your husband or wife

plural moth·ers–in–law \ˈmə-thər-zən-\

Full Definition of MOTHER-IN-LAW

1
:  the mother of one's spouse
2
archaic :  stepmother

First Known Use of MOTHER-IN-LAW

14th century

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