sis·ter-in-law
| \ ˈsi-st(ə-)rən-ˌlȯ
, -tərn-ˌlȯ \
, -tərn-ˌlȯ \
plural sisters-in-law\
ˈsi-stər-zən-ˌlȯ
\
\
Definition of sister-in-law
1
: the sister of one's spouse
2a
: the wife of one's sibling
b
: the wife of one's spouse's sibling
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“Sister-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister-in-law. Accessed 24 May. 2022.
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The first known use of sister-in-law was in the 15th century
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