Co-sibling-in-law

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    One's spouse's sibling's spouse; either of two (or more) people who marry siblings, from the perspective of the other. rare
  2. 2
    One's sibling's spouse's sibling; either of two (or more) people whose siblings marry each other, from the perspective of the other. rare

Etymology

From co- + sibling-in-law.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.