sister-in-law

noun
sis·​ter-in-law | \ ˈsi-st(ə-)rən-ˌlȯ How to pronounce sister-in-law (audio) , -tərn-ˌlȯ \
plural sisters-in-law\ ˈsi-​stər-​zən-​ˌlȯ How to pronounce sister-in-law (audio) \

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

First Known Use of sister-in-law

15th century, in the meaning defined at sense 1

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The first known use of sister-in-law was in the 15th century

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Cite this Entry

“Sister-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister-in-law. Accessed 16 Apr. 2021.

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More Definitions for sister-in-law

sister-in-law

noun

English Language Learners Definition of sister-in-law

: the sister of your husband or wife
: the wife of your brother

sister-in-law

noun
sis·​ter-in-law | \ ˈsi-stər-ən-ˌlȯ \
plural sisters-in-law

Kids Definition of sister-in-law

1 : the sister of someone's husband or wife
2 : the wife of someone's brother

More from Merriam-Webster on sister-in-law

Nglish: Translation of sister-in-law for Spanish Speakers

Britannica English: Translation of sister-in-law for Arabic Speakers

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