sister-in-law

noun

sis·​ter-in-law ˈsi-st(ə-)rən-ˌlȯ 

-tərn-ˌlȯ

plural sisters-in-law 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

Examples of sister-in-law in a Sentence

Recent Examples on the Web

Livia’s sister-in-law invokes the poem when Livia learns, to her surprise, that her manipulative, abusive mother had been a frustrated musician. — Sam Worley, Vulture, 5 Oct. 2026

Dillard has known Tracy for decades and ran for governor in 2014 with Tracy’s sister-in-law, Jil Tracy, as his running mate. — Olivia Olander, Chicago Tribune, 4 Oct. 2026

Rodriguez is survived by his parents, his wife, Sandy, their two sons and his sister-in-law. — Alexandra Del Rosario, Los Angeles Times, 3 Oct. 2026

Kirkpatrick and Hoxha married in August and had spent a week in Mexico before meeting up with her brother and sister-in-law in Athens and had been there for nine days, according to ABC News. — Theresa Braine, New York Daily News, 1 Oct. 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for sister-in-law

• avoirdupois
• aa
• aha
• bashaw
• bradshaw
• byelaw
• bylaw
• chainsaw
• cheraw
• coleslaw
• crenshaw
• dada

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