sister-in-law

noun sis·ter-in-law \ ˈsi-st(ə-)rən-ˌlȯ , -tərn-ˌlȯ \
plural sisters-in-law play \ˈsi-stər-zən-ˌlȯ\
1 : the sister of one's spouse
2 a : the wife of one's sibling
b : the wife of one's spouse's sibling

First Known Use of sister-in-law

15th century


SISTER-IN-LAW Defined for English Language Learners

sister-in-law

  • : the sister of your husband or wife

  • : the wife of your brother


SISTER-IN-LAW Defined for Kids

sister-in-law

noun sis·ter-in-law \ ˈsi-stər-ən-ˌlȯ \
plural sisters-in-law
1 : the sister of someone's husband or wife
2 : the wife of someone's brother


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