Added 9 October 2026 seatbelt /ˈsiːt.belt/ noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about seatbelt at Wordnik → Where our words come from → A safety belt used in a car or plane to hold you in your seat in case of an accident. Origin Compound of seat + belt. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: strapbeltgirdlesashwaistunbuckledbuckleairbagunbucklingheadrestlifejacketunbelted Back to today's word