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

Examples of sister-in-law in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Joanne can tell there’s trouble when the woman who may one day become her sister-in-law shows up to a double date with bangs. Judy Berman, Time, 23 Oct. 2025 Noah's sister-in-law Esther (Jackie Tohn), the Jewish character portrayed most insultingly last year, has thankfully been softened and refined, and has somehow become the lone voice of reason amongst a group of immature idiots. Kelly Lawler, USA Today, 23 Oct. 2025 The deeply goyish Joanne starts to weigh religious conversion as her relationship with Noah gets more serious, an intriguing internal conflict the show illustrated with external obstacles like Noah’s mother Bina (Tovah Feldshuh) and sister-in-law Esther (Jackie Tohn). Alison Herman, Variety, 23 Oct. 2025 Until then, the show gets by on the charm of its supporting characters, including Noah’s brother, Sasha (Timothy Simons), and sister-in-law, Esther (Jackie Tohn). Kristen Baldwin, Entertainment Weekly, 23 Oct. 2025 See All Example Sentences for sister-in-law

Word History

First Known Use

15th century, in the meaning defined at sense 1

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

Browse Nearby Words

Cite this Entry

“Sister-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister-in-law. Accessed 29 Oct. 2025.

Kids Definition

sister-in-law

noun
sis·​ter-in-law
ˈsis-t(ə-)rən-ˌlȯ,
-tərn-ˌlȯ
plural sisters-in-law
-tər-zən-
1
: the sister of one's spouse
2
a
: the wife of one's sibling
b
: the wife of one's spouse's sibling

More from Merriam-Webster on sister-in-law

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