sister-in-law
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sis·ter–in–law

noun \ˈsis-t(ə-)rən-ˌl, -tərn-ˌl\
plural sis·ters–in–law \-tər-zən-\

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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