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sister-in-law

nouncommon in dialogue

  • United Kingdom//ˈsɪs.tə.ɪn.lɔː//
  • United States//ˈsɪs.tɚ.ɪn.lɔ//

A female relative of one's generation, separated by one degree of marriage: The sister of one's spouse.

noun

  1. 1

    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.

  2. 2

    A female relative of one's generation, separated by one degree of marriage: The wife of one's sibling.

    My sister-in-law and my brother met while they were both on vacation in Jamaica.

  3. 3

    Co-sister-in-law: The wife of one's sibling-in-law. The wife of the sibling of one's spouse.

  4. 4

    Co-sister-in-law: The wife of one's sibling-in-law. The sister of the spouse of one's sibling.

Etymology

Inherited from Middle English suster-in-lawe; equivalent to sister + -in-law.

Forms

plural
sisters-in-law, sister-in-laws
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).