Added 10 October 2026 grandpapa noun Categories: Rare Words noun ! Definition from Wiktionary (CC BY-SA). More about grandpapa at Wordnik → Where our words come from → grandfather Origin From grand- + papa. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: granddadgrampagrandpagrandadpapigrandpapgrandpappygranpappygrandpawgranddaddygrandpoppagranther Back to today's word