Added 10 October 2026 aunt-in-law noun noun ! Definition from Wiktionary (CC BY-SA). More about aunt-in-law at Wordnik → Where our words come from → The wife of one's uncle or aunt (parent's sibling). The aunt of one's spouse. The aunt of one's husband. The aunt of one's wife. The aunt of one's husband. Origin From aunt + -in-law. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: uncle-in-lawauntauncleniece-in-lawsister-in-lawbrother-in-lawnephew-in-lawgreat-auntuncle Back to today's word