Added 10 October 2026 painkiller /ˈpeɪnˌkɪlə(ɹ)/ noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about painkiller at Wordnik → Where our words come from → A medicine used to relieve pain. Origin From pain + killer. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: analgesicanodyneanestheticsedativetranquilizertranquilliserpillpaindwellinghousinghome Back to today's word