Dictionary

father–in–law

noun \ˈfä-thə-rən-ˌl, -thərn-ˌl\

: the father of your husband or wife

plural fa·thers–in–law \-thər-zən-\

Full Definition of FATHER-IN-LAW

1
:  the father of one's spouse
2
archaic :  stepfather

First Known Use of FATHER-IN-LAW

14th century

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