Dictionary

sister–in–law

noun sis·ter–in–law \ˈsis-t(ə-)rən-ˌl, -tərn-ˌl\

: the sister of your husband or wife

: the wife of your brother

plural sis·ters–in–law \-tər-zən-\

Full Definition of SISTER-IN-LAW

1
:  the sister of one's spouse
2
a :  the wife of one's brother
b :  the wife of one's spouse's brother

First Known Use of SISTER-IN-LAW

15th century

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