noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A relative of one's generation, separated by one degree of marriage:; The sibling of one's spouse.
2. 2
   A relative of one's generation, separated by one degree of marriage:; The spouse of one's sibling.
3. 3
   Co-sibling-in-law: A relative of one's generation, separated by two degrees of marriage:; The spouse of the sibling of one's spouse. uncommon
4. 4
   Co-sibling-in-law: A relative of one's generation, separated by two degrees of marriage:; The sibling of the spouse of one's sibling. uncommon

Synonyms

All synonyms

sib-in-law

Etymology

From sibling + -in-law.

Related phrases

co-sibling-in-lawhalf sibling-in-law

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