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sister-in-law
WIKTIONARY
sister-in-law
Noun
  • A female relative of one's generation, separated by one degree of marriage:
    • The sister of one's spouse.
    • The wife of one's sibling.
  • Co-sister-in-law: The wife of one's sibling-in-law. less common
    • The wife of the child of one's spouse.
    • The sister of the spouse of one's sibling.