Added 10 October 2026
sister-in-law
/ˈsɪs.tɚ.ɪn.lɔ/ noun
In Latin: glōs Wiktionary
noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about sister-in-law at Wordnik → Where our words come from →
-
A female relative of one's generation, separated by one degree of marriage: The sister of one's spouse.
Though they are not twins, my sister-in-law resembles my wife in almost every way.
-
The sister of one's spouse.
Though they are not twins, my sister-in-law resembles my wife in almost every way.
-
The wife of one's sibling.
My sister-in-law and my brother met while they were both on vacation in Jamaica.
Origin
Inherited from Middle English suster-in-lawe; equivalent to sister + -in-law.
From Wiktionary, via Kaikki.org (CC BY-SA)